<?xml version="1.0" encoding="us-ascii"?>
<!--XBRL document created by RR Donnelley  using XBRLCloud Definition Linkbase Generator.-->
<link:linkbase xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:link="http://www.xbrl.org/2003/linkbase" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentDocumentandEntityInformation" roleURI="http://www.ProFunds.com/role/DocumentDocumentandEntityInformation" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledBULLPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesBULLPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesBULLPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedBULLPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledBULLPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsBULLPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsMIDCAPPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsSMALLCAPPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsNASDAQ100PROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledLARGECAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledLARGE-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesLARGECAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesLARGE-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesLARGECAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesLARGE-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedLARGECAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedLARGE-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedLARGECAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedLARGE-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsLARGECAPVALUEPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsLARGE-CAPVALUEPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedLARGECAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedLARGE-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledLARGECAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledLARGE-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsLARGECAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsLARGE-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledLARGECAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledLARGE-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesLARGECAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesLARGE-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesLARGECAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesLARGE-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedLARGECAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedLARGE-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedLARGECAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedLARGE-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsLARGECAPGROWTHPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsLARGE-CAPGROWTHPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedLARGECAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedLARGE-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledLARGECAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledLARGE-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsLARGECAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsLARGE-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledMIDCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesMIDCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesMIDCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedMIDCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedMIDCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsMIDCAPVALUEPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPVALUEPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedMIDCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledMIDCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsMIDCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledMIDCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesMIDCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesMIDCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedMIDCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedMIDCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsMIDCAPGROWTHPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPGROWTHPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedMIDCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledMIDCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsMIDCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledSMALLCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesSMALLCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesSMALLCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedSMALLCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedSMALLCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsSMALLCAPVALUEPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPVALUEPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedSMALLCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledSMALLCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsSMALLCAPVALUEPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPVALUEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledSMALLCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesSMALLCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesSMALLCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedSMALLCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedSMALLCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsSMALLCAPGROWTHPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPGROWTHPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedSMALLCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledSMALLCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsSMALLCAPGROWTHPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPGROWTHPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledEUROPE30PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledEUROPE30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesEUROPE30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesEUROPE30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesEUROPE30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesEUROPE30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedEUROPE30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedEUROPE30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedEUROPE30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedEUROPE30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsEUROPE30PROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsEUROPE30PROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedEUROPE30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedEUROPE30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledEUROPE30PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledEUROPE30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsEUROPE30PROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsEUROPE30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRABULLPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRABULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRABULLPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRABULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRABULLPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRABULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRABULLPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRABULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRABULLPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRABULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRABULLPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRABULLPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRABULLPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRABULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRABULLPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRABULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRABULLPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRABULLPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRAMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRAMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRAMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRAMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRAMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRAMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRAMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRAMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRAMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRAMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRAMIDCAPPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRAMID-CAPPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRAMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRAMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRAMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRAMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRAMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRAMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRASMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRASMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRASMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRASMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRASMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRASMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRASMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRASMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRASMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRASMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRASMALLCAPPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRASMALL-CAPPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRASMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRASMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRASMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRASMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRASMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRASMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRADOW30PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRADOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRADOW30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRADOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRADOW30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRADOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRADOW30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRADOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRADOW30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRADOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRADOW30PROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRADOW30PROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRADOW30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRADOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRADOW30PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRADOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRADOW30PROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRADOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRANASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRANASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRANASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRANASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRANASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRANASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRANASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRANASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRANASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRANASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRANASDAQ100PROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRANASDAQ-100PROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRANASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRANASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRANASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRANASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRANASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRANASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRAINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRAINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRAINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRAINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRAINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRAINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRAINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRAINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRAINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRAINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRAINTERNATIONALPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRAINTERNATIONALPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRAINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRAINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRAINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRAINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRAINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRAINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRAEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRAEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRAEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRAEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRAEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRAEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRAEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRAEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRAEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRAEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRAEMERGINGMARKETSPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRAEMERGINGMARKETSPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRAEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRAEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRAEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRAEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRAEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRAEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRALATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRALATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRALATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRALATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRALATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRALATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRALATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRALATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRALATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRALATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRALATINAMERICAPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRALATINAMERICAPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRALATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRALATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRALATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRALATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRALATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRALATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledUltraChinaProFund" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledUltraChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesUltraChinaProFund" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesUltraChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesUltraChinaProFund" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesUltraChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedUltraChinaProFund" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedUltraChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedUltraChinaProFund" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedUltraChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsUltraChinaProFundBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsUltraChinaProFundBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedUltraChinaProFund" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedUltraChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledUltraChinaProFund" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledUltraChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsUltraChinaProFund" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsUltraChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRAJAPANPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRAJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRAJAPANPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRAJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRAJAPANPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRAJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRAJAPANPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRAJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRAJAPANPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRAJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRAJAPANPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRAJAPANPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRAJAPANPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRAJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRAJAPANPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRAJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRAJAPANPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRAJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledBEARPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesBEARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesBEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesBEARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedBEARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedBEARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsBEARPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBEARPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedBEARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledBEARPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsBEARPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledSHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesSHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesSHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesSHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedSHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedSHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsSHORTSMALLCAPPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSHORTSMALL-CAPPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedSHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledSHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsSHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledSHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesSHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesSHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesSHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedSHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedSHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsSHORTNASDAQ100PROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSHORTNASDAQ-100PROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedSHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledSHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsSHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRABEARPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRABEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRABEARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRABEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRABEARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRABEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRABEARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRABEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRABEARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRABEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRABEARPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRABEARPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRABEARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRABEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRABEARPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRABEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRABEARPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRABEARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRASHORTMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRASHORTMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRASHORTMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRASHORTMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRASHORTMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRASHORTMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRASHORTMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRASHORTMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRASHORTMIDCAPPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRASHORTMID-CAPPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRASHORTMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRASHORTMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRASHORTMIDCAPPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRASHORTMID-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRASHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRASHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRASHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRASHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRASHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRASHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRASHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRASHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRASHORTSMALLCAPPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRASHORTSMALL-CAPPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRASHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRASHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRASHORTSMALLCAPPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRASHORTSMALL-CAPPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRASHORTDOW30PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRASHORTDOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRASHORTDOW30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRASHORTDOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRASHORTDOW30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRASHORTDOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRASHORTDOW30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRASHORTDOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTDOW30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTDOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRASHORTDOW30PROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRASHORTDOW30PROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTDOW30PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTDOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRASHORTDOW30PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRASHORTDOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRASHORTDOW30PROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRASHORTDOW30PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRASHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRASHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRASHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRASHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRASHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRASHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRASHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRASHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRASHORTNASDAQ100PROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRASHORTNASDAQ-100PROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRASHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRASHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRASHORTNASDAQ100PROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRASHORTNASDAQ-100PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRASHORTINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRASHORTINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRASHORTINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRASHORTINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRASHORTINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRASHORTINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRASHORTINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRASHORTINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRASHORTINTERNATIONALPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRASHORTINTERNATIONALPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRASHORTINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRASHORTINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRASHORTINTERNATIONALPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRASHORTINTERNATIONALPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRASHORTEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRASHORTEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRASHORTEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRASHORTEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRASHORTEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRASHORTEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRASHORTEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRASHORTEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRASHORTEMERGINGMARKETSPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRASHORTEMERGINGMARKETSPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRASHORTEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRASHORTEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRASHORTEMERGINGMARKETSPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRASHORTEMERGINGMARKETSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRASHORTLATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRASHORTLATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRASHORTLATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRASHORTLATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRASHORTLATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRASHORTLATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRASHORTLATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRASHORTLATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTLATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTLATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRASHORTLATINAMERICAPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRASHORTLATINAMERICAPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTLATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTLATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRASHORTLATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRASHORTLATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRASHORTLATINAMERICAPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRASHORTLATINAMERICAPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledUltraShortChinaProFund" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledUltraShortChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesUltraShortChinaProFund" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesUltraShortChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesUltraShortChinaProFund" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesUltraShortChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedUltraShortChinaProFund" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedUltraShortChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedUltraShortChinaProFund" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedUltraShortChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsUltraShortChinaProFundBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsUltraShortChinaProFundBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedUltraShortChinaProFund" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedUltraShortChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledUltraShortChinaProFund" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledUltraShortChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsUltraShortChinaProFund" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsUltraShortChinaProFund" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledULTRASHORTJAPANPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledULTRASHORTJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesULTRASHORTJAPANPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesULTRASHORTJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesULTRASHORTJAPANPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesULTRASHORTJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedULTRASHORTJAPANPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedULTRASHORTJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTJAPANPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedULTRASHORTJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsULTRASHORTJAPANPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsULTRASHORTJAPANPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTJAPANPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedULTRASHORTJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledULTRASHORTJAPANPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledULTRASHORTJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsULTRASHORTJAPANPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsULTRASHORTJAPANPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledBANKSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBANKSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesBANKSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesBANKSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesBANKSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBANKSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedBANKSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBANKSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedBANKSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBANKSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsBANKSULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBANKSULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedBANKSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBANKSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledBANKSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBANKSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsBANKSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBANKSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledBASICMATERIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBASICMATERIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesBASICMATERIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesBASICMATERIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesBASICMATERIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBASICMATERIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedBASICMATERIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBASICMATERIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedBASICMATERIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBASICMATERIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsBASICMATERIALSULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBASICMATERIALSULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedBASICMATERIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBASICMATERIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledBASICMATERIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBASICMATERIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsBASICMATERIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBASICMATERIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledBIOTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBIOTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesBIOTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesBIOTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesBIOTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBIOTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedBIOTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBIOTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedBIOTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBIOTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsBIOTECHNOLOGYULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBIOTECHNOLOGYULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedBIOTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBIOTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledBIOTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBIOTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsBIOTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBIOTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledCONSUMERGOODSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledCONSUMERGOODSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesCONSUMERGOODSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesCONSUMERGOODSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesCONSUMERGOODSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesCONSUMERGOODSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedCONSUMERGOODSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedCONSUMERGOODSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedCONSUMERGOODSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedCONSUMERGOODSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsCONSUMERGOODSULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsCONSUMERGOODSULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedCONSUMERGOODSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedCONSUMERGOODSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledCONSUMERGOODSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledCONSUMERGOODSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsCONSUMERGOODSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsCONSUMERGOODSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledCONSUMERSERVICESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledCONSUMERSERVICESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesCONSUMERSERVICESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesCONSUMERSERVICESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesCONSUMERSERVICESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesCONSUMERSERVICESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedCONSUMERSERVICESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedCONSUMERSERVICESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedCONSUMERSERVICESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedCONSUMERSERVICESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsCONSUMERSERVICESULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsCONSUMERSERVICESULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedCONSUMERSERVICESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedCONSUMERSERVICESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledCONSUMERSERVICESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledCONSUMERSERVICESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsCONSUMERSERVICESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsCONSUMERSERVICESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledFINANCIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledFINANCIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesFINANCIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesFINANCIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesFINANCIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesFINANCIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedFINANCIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedFINANCIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedFINANCIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedFINANCIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsFINANCIALSULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsFINANCIALSULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedFINANCIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedFINANCIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledFINANCIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledFINANCIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsFINANCIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsFINANCIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledHEALTHCAREULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledHEALTHCAREULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesHEALTHCAREULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesHEALTHCAREULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesHEALTHCAREULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesHEALTHCAREULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedHEALTHCAREULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedHEALTHCAREULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedHEALTHCAREULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedHEALTHCAREULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsHEALTHCAREULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsHEALTHCAREULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedHEALTHCAREULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedHEALTHCAREULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledHEALTHCAREULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledHEALTHCAREULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsHEALTHCAREULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsHEALTHCAREULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledINDUSTRIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledINDUSTRIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesINDUSTRIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesINDUSTRIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesINDUSTRIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesINDUSTRIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedINDUSTRIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedINDUSTRIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedINDUSTRIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedINDUSTRIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsINDUSTRIALSULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsINDUSTRIALSULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedINDUSTRIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedINDUSTRIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledINDUSTRIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledINDUSTRIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsINDUSTRIALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsINDUSTRIALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledINTERNETULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledINTERNETULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesINTERNETULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesINTERNETULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesINTERNETULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesINTERNETULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedINTERNETULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedINTERNETULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedINTERNETULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedINTERNETULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsINTERNETULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsINTERNETULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedINTERNETULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedINTERNETULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledINTERNETULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledINTERNETULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsINTERNETULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsINTERNETULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsMOBILETELECOMMUNICATIONSULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMOBILETELECOMMUNICATIONSULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMOBILETELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledOILGASULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledOIL&amp;GASULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesOILGASULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesOILGASULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesOILGASULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesOILGASULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedOILGASULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedOILGASULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedOILGASULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedOIL&amp;GASULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsOILGASULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsOILGASULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedOILGASULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedOILGASULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledOILGASULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledOIL&amp;GASULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsOILGASULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsOIL&amp;GASULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledOILEQUIPMENT,SERVICES&amp;DISTRIBUTIONULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedOILEQUIPMENT,SERVICES&amp;DISTRIBUTIONULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledOILEQUIPMENT,SERVICES&amp;DISTRIBUTIONULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsOILEQUIPMENTSERVICESDISTRIBUTIONULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsOILEQUIPMENT,SERVICES&amp;DISTRIBUTIONULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledPHARMACEUTICALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledPHARMACEUTICALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesPHARMACEUTICALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesPHARMACEUTICALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesPHARMACEUTICALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesPHARMACEUTICALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedPHARMACEUTICALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedPHARMACEUTICALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedPHARMACEUTICALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedPHARMACEUTICALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsPHARMACEUTICALSULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsPHARMACEUTICALSULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedPHARMACEUTICALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedPHARMACEUTICALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledPHARMACEUTICALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledPHARMACEUTICALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsPHARMACEUTICALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsPHARMACEUTICALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledPRECIOUSMETALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledPRECIOUSMETALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesPRECIOUSMETALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesPRECIOUSMETALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesPRECIOUSMETALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesPRECIOUSMETALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedPRECIOUSMETALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedPRECIOUSMETALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedPRECIOUSMETALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedPRECIOUSMETALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsPRECIOUSMETALSULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsPRECIOUSMETALSULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedPRECIOUSMETALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedPRECIOUSMETALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledPRECIOUSMETALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledPRECIOUSMETALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsPRECIOUSMETALSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsPRECIOUSMETALSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledREALESTATEULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledREALESTATEULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesREALESTATEULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesREALESTATEULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesREALESTATEULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesREALESTATEULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedREALESTATEULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedREALESTATEULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedREALESTATEULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedREALESTATEULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsREALESTATEULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsREALESTATEULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedREALESTATEULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedREALESTATEULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledREALESTATEULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledREALESTATEULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsREALESTATEULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsREALESTATEULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledSEMICONDUCTORULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSEMICONDUCTORULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesSEMICONDUCTORULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesSEMICONDUCTORULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesSEMICONDUCTORULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSEMICONDUCTORULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedSEMICONDUCTORULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSEMICONDUCTORULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedSEMICONDUCTORULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSEMICONDUCTORULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsSEMICONDUCTORULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSEMICONDUCTORULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedSEMICONDUCTORULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSEMICONDUCTORULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledSEMICONDUCTORULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSEMICONDUCTORULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsSEMICONDUCTORULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSEMICONDUCTORULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsTECHNOLOGYULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsTECHNOLOGYULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsTECHNOLOGYULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsTECHNOLOGYULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledTELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledTELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesTELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesTELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesTELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesTELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedTELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedTELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedTELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedTELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsTELECOMMUNICATIONSULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsTELECOMMUNICATIONSULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedTELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedTELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledTELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledTELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsTELECOMMUNICATIONSULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsTELECOMMUNICATIONSULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledUTILITIESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledUTILITIESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesUTILITIESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesUTILITIESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesUTILITIESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesUTILITIESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedUTILITIESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedUTILITIESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedUTILITIESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedUTILITIESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsUTILITIESULTRASECTORPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsUTILITIESULTRASECTORPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedUTILITIESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedUTILITIESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledUTILITIESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledUTILITIESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsUTILITIESULTRASECTORPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsUTILITIESULTRASECTORPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledSHORTOILGASPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSHORTOIL&amp;GASPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesSHORTOILGASPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesSHORTOILGASPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesSHORTOILGASPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSHORTOILGASPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedSHORTOILGASPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSHORTOILGASPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedSHORTOILGASPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSHORTOIL&amp;GASPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsSHORTOILGASPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSHORTOILGASPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedSHORTOILGASPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSHORTOILGASPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledSHORTOILGASPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSHORTOIL&amp;GASPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsSHORTOILGASPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSHORTOIL&amp;GASPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledSHORTPRECIOUSMETALSPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSHORTPRECIOUSMETALSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesSHORTPRECIOUSMETALSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesSHORTPRECIOUSMETALSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesSHORTPRECIOUSMETALSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSHORTPRECIOUSMETALSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedSHORTPRECIOUSMETALSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSHORTPRECIOUSMETALSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedSHORTPRECIOUSMETALSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSHORTPRECIOUSMETALSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsSHORTPRECIOUSMETALSPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSHORTPRECIOUSMETALSPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedSHORTPRECIOUSMETALSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSHORTPRECIOUSMETALSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledSHORTPRECIOUSMETALSPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSHORTPRECIOUSMETALSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsSHORTPRECIOUSMETALSPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSHORTPRECIOUSMETALSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledSHORTREALESTATEPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSHORTREALESTATEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesSHORTREALESTATEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesSHORTREALESTATEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesSHORTREALESTATEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSHORTREALESTATEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedSHORTREALESTATEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSHORTREALESTATEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedSHORTREALESTATEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSHORTREALESTATEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsSHORTREALESTATEPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSHORTREALESTATEPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedSHORTREALESTATEPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSHORTREALESTATEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledSHORTREALESTATEPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSHORTREALESTATEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsSHORTREALESTATEPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSHORTREALESTATEPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledUSGOVERNMENTPLUSPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledU.S.GOVERNMENTPLUSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesUSGOVERNMENTPLUSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesU.S.GOVERNMENTPLUSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesUSGOVERNMENTPLUSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesU.S.GOVERNMENTPLUSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedUSGOVERNMENTPLUSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedU.S.GOVERNMENTPLUSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedUSGOVERNMENTPLUSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedU.S.GOVERNMENTPLUSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsUSGOVERNMENTPLUSPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsU.S.GOVERNMENTPLUSPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedUSGOVERNMENTPLUSPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedU.S.GOVERNMENTPLUSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledUSGOVERNMENTPLUSPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledU.S.GOVERNMENTPLUSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsUSGOVERNMENTPLUSPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsU.S.GOVERNMENTPLUSPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledRISINGRATESOPPORTUNITY10PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledRISINGRATESOPPORTUNITY10PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesRISINGRATESOPPORTUNITY10PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesRISINGRATESOPPORTUNITY10PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesRISINGRATESOPPORTUNITY10PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesRISINGRATESOPPORTUNITY10PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedRISINGRATESOPPORTUNITY10PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedRISINGRATESOPPORTUNITY10PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedRISINGRATESOPPORTUNITY10PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedRISINGRATESOPPORTUNITY10PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsRISINGRATESOPPORTUNITY10PROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsRISINGRATESOPPORTUNITY10PROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedRISINGRATESOPPORTUNITY10PROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedRISINGRATESOPPORTUNITY10PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledRISINGRATESOPPORTUNITY10PROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledRISINGRATESOPPORTUNITY10PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsRISINGRATESOPPORTUNITY10PROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsRISINGRATESOPPORTUNITY10PROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledRISINGRATESOPPORTUNITYPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledRISINGRATESOPPORTUNITYPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesRISINGRATESOPPORTUNITYPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesRISINGRATESOPPORTUNITYPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesRISINGRATESOPPORTUNITYPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesRISINGRATESOPPORTUNITYPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedRISINGRATESOPPORTUNITYPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedRISINGRATESOPPORTUNITYPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedRISINGRATESOPPORTUNITYPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedRISINGRATESOPPORTUNITYPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsRISINGRATESOPPORTUNITYPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsRISINGRATESOPPORTUNITYPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedRISINGRATESOPPORTUNITYPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedRISINGRATESOPPORTUNITYPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledRISINGRATESOPPORTUNITYPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledRISINGRATESOPPORTUNITYPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsRISINGRATESOPPORTUNITYPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsRISINGRATESOPPORTUNITYPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledFALLINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledFALLINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesFALLINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesFALLINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesFALLINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesFALLINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedFALLINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedFALLINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedFALLINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedFALLINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsFALLINGUSDOLLARPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsFALLINGU.S.DOLLARPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedFALLINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedFALLINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledFALLINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledFALLINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsFALLINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsFALLINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnSummaryUnlabeledRISINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledRISINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleShareholderFeesRISINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleShareholderFeesRISINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualFundOperatingExpensesRISINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesRISINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleTransposedRISINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedRISINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleExpenseExampleNoRedemptionTransposedRISINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedRISINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAnnualTotalReturnsRISINGUSDOLLARPROFUNDBarChart" roleURI="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsRISINGU.S.DOLLARPROFUNDBarChart" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#ScheduleAverageAnnualTotalReturnsTransposedRISINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedRISINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DocumentRiskReturnDetailUnlabeledRISINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledRISINGU.S.DOLLARPROFUND" />
  <link:roleRef xlink:type="simple" xlink:href="pf4-20121128.xsd#DisclosureRiskReturnDetailDataElementsRISINGUSDOLLARPROFUND" roleURI="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsRISINGU.S.DOLLARPROFUND" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all" />
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentDocumentandEntityInformation" xlink:title="000000 - Document - Document and Entity Information">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentDocumentandEntityInformation" xlink:title="000000 - Document - Document and Entity Information">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentType" xlink:label="dei_DocumentType" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_AmendmentDescription" xlink:label="dei_AmendmentDescription" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_TradingSymbol" xlink:label="dei_TradingSymbol" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentCreationDate" xlink:label="dei_DocumentCreationDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentEffectiveDate" xlink:label="dei_DocumentEffectiveDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusDate" xlink:label="rr_ProspectusDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_DocumentType" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_DocumentPeriodEndDate" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_EntityRegistrantName" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_EntityCentralIndexKey" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_AmendmentFlag" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_AmendmentDescription" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_TradingSymbol" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_DocumentCreationDate" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_DocumentEffectiveDate" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusDate" order="10" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003059Member" xlink:label="pf4_S000003059Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003059Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012241Member" xlink:label="pf4_C000012241Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008334Member" xlink:label="pf4_C000008334Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008335Member" xlink:label="pf4_C000008335Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012241Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008334Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008335Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnHeading" xlink:label="rr_RiskReturnHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveHeading" xlink:label="rr_ObjectiveHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectivePrimaryTextBlock" xlink:label="rr_ObjectivePrimaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveSecondaryTextBlock" xlink:label="rr_ObjectiveSecondaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseHeading" xlink:label="rr_ExpenseHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseNarrativeTextBlock" xlink:label="rr_ExpenseNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesCaption" xlink:label="rr_ShareholderFeesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesTableTextBlock" xlink:label="rr_ShareholderFeesTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesCaption" xlink:label="rr_OperatingExpensesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualFundOperatingExpensesTableTextBlock" xlink:label="rr_AnnualFundOperatingExpensesTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseFootnotesTextBlock" xlink:label="rr_ExpenseFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesDeferredChargesTextBlock" xlink:label="rr_ExpensesDeferredChargesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRangeOfExchangeFeesTextBlock" xlink:label="rr_ExpensesRangeOfExchangeFeesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleHeading" xlink:label="rr_ExpenseExampleHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearHeading" xlink:label="rr_ExpenseExampleByYearHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNarrativeTextBlock" xlink:label="rr_ExpenseExampleNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearCaption" xlink:label="rr_ExpenseExampleByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleWithRedemptionTableTextBlock" xlink:label="rr_ExpenseExampleWithRedemptionTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionNarrativeTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearCaption" xlink:label="rr_ExpenseExampleNoRedemptionByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionTableTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleFootnotesTextBlock" xlink:label="rr_ExpenseExampleFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleClosingTextBlock" xlink:label="rr_ExpenseExampleClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverHeading" xlink:label="rr_PortfolioTurnoverHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverTextBlock" xlink:label="rr_PortfolioTurnoverTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyHeading" xlink:label="rr_StrategyHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyNarrativeTextBlock" xlink:label="rr_StrategyNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskHeading" xlink:label="rr_RiskHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNarrativeTextBlock" xlink:label="rr_RiskNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskFootnotesTextBlock" xlink:label="rr_RiskFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskClosingTextBlock" xlink:label="rr_RiskClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartAndPerformanceTableHeading" xlink:label="rr_BarChartAndPerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceNarrativeTextBlock" xlink:label="rr_PerformanceNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartNarrativeTextBlock" xlink:label="rr_BarChartNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHeading" xlink:label="rr_BarChartHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableTextBlock" xlink:label="rr_BarChartTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartFootnotesTextBlock" xlink:label="rr_BarChartFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartClosingTextBlock" xlink:label="rr_BarChartClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableHeading" xlink:label="rr_PerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableTextBlock" xlink:label="rr_PerformanceTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNarrativeTextBlock" xlink:label="rr_PerformanceTableNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MarketIndexPerformanceTableTextBlock" xlink:label="rr_MarketIndexPerformanceTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesTextBlock" xlink:label="rr_PerformanceTableFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableClosingTextBlock" xlink:label="rr_PerformanceTableClosingTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnHeading" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveHeading" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectivePrimaryTextBlock" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveSecondaryTextBlock" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseHeading" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseNarrativeTextBlock" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesCaption" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesTableTextBlock" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesCaption" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualFundOperatingExpensesTableTextBlock" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseFootnotesTextBlock" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesDeferredChargesTextBlock" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRangeOfExchangeFeesTextBlock" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleHeading" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearHeading" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNarrativeTextBlock" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearCaption" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleWithRedemptionTableTextBlock" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionByYearCaption" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionTableTextBlock" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleFootnotesTextBlock" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleClosingTextBlock" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverHeading" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverTextBlock" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyHeading" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyNarrativeTextBlock" order="27" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskHeading" order="28" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNarrativeTextBlock" order="29" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskFootnotesTextBlock" order="30" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskClosingTextBlock" order="31" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartAndPerformanceTableHeading" order="32" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceNarrativeTextBlock" order="33" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartNarrativeTextBlock" order="34" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHeading" order="35" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartTableTextBlock" order="36" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartFootnotesTextBlock" order="37" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartClosingTextBlock" order="38" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableHeading" order="39" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableTextBlock" order="40" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNarrativeTextBlock" order="41" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MarketIndexPerformanceTableTextBlock" order="42" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesTextBlock" order="43" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableClosingTextBlock" order="44" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledBULLPROFUND" xlink:title="000011 - Document - Risk/Return Summary {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003059Member" xlink:label="pf4_S000003059Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003059Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012241Member" xlink:label="pf4_C000012241Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008334Member" xlink:label="pf4_C000008334Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008335Member" xlink:label="pf4_C000008335Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012241Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008334Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008335Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesAbstract" xlink:label="rr_ShareholderFeesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:ShareholderFeesAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesAbstract" xlink:label="rr_ShareholderFeesAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesColumnName" xlink:label="rr_ShareholderFeesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOfferingPrice" xlink:label="rr_MaximumCumulativeSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOther" xlink:label="rr_MaximumCumulativeSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" xlink:label="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOfferingPrice" xlink:label="rr_MaximumDeferredSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOther" xlink:label="rr_MaximumDeferredSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" xlink:label="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFeeOverRedemption" xlink:label="rr_RedemptionFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFee" xlink:label="rr_RedemptionFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFeeOverRedemption" xlink:label="rr_ExchangeFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFee" xlink:label="rr_ExchangeFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFeeOverAssets" xlink:label="rr_MaximumAccountFeeOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFee" xlink:label="rr_MaximumAccountFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeeOther" xlink:label="rr_ShareholderFeeOther" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ShareholderFeesColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOfferingPrice" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOther" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOfferingPrice" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOther" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_RedemptionFeeOverRedemption" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_RedemptionFee" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ExchangeFeeOverRedemption" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ExchangeFee" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumAccountFeeOverAssets" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumAccountFee" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ShareholderFeeOther" order="14" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesBULLPROFUND" xlink:title="000012 - Schedule - Shareholder Fees {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003059Member" xlink:label="pf4_S000003059Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003059Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012241Member" xlink:label="pf4_C000012241Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008334Member" xlink:label="pf4_C000008334Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008335Member" xlink:label="pf4_C000008335Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012241Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008334Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008335Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesAbstract" xlink:label="rr_OperatingExpensesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:OperatingExpensesAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesAbstract" xlink:label="rr_OperatingExpensesAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesColumnName" xlink:label="rr_OperatingExpensesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ManagementFeesOverAssets" xlink:label="rr_ManagementFeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionAndService12b1FeesOverAssets" xlink:label="rr_DistributionAndService12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionOrSimilarNon12b1FeesOverAssets" xlink:label="rr_DistributionOrSimilarNon12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component1OtherExpensesOverAssets" xlink:label="rr_Component1OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component2OtherExpensesOverAssets" xlink:label="rr_Component2OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component3OtherExpensesOverAssets" xlink:label="rr_Component3OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesOverAssets" xlink:label="rr_OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AcquiredFundFeesAndExpensesOverAssets" xlink:label="rr_AcquiredFundFeesAndExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOverAssets" xlink:label="rr_ExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssets" xlink:label="rr_FeeWaiverOrReimbursementOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_NetExpensesOverAssets" xlink:label="rr_NetExpensesOverAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_OperatingExpensesColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ManagementFeesOverAssets" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_DistributionAndService12b1FeesOverAssets" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_DistributionOrSimilarNon12b1FeesOverAssets" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_Component1OtherExpensesOverAssets" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_Component2OtherExpensesOverAssets" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_Component3OtherExpensesOverAssets" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_OtherExpensesOverAssets" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_AcquiredFundFeesAndExpensesOverAssets" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ExpensesOverAssets" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssets" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_NetExpensesOverAssets" order="12" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesBULLPROFUND" xlink:title="000013 - Schedule - Annual Fund Operating Expenses {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003059Member" xlink:label="pf4_S000003059Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003059Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012241Member" xlink:label="pf4_C000012241Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008334Member" xlink:label="pf4_C000008334Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008335Member" xlink:label="pf4_C000008335Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012241Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008334Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008335Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleAbstract" xlink:label="rr_ExpenseExampleAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:ExpenseExampleAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleAbstract" xlink:label="rr_ExpenseExampleAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearColumnName" xlink:label="rr_ExpenseExampleByYearColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear01" xlink:label="rr_ExpenseExampleYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear03" xlink:label="rr_ExpenseExampleYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear05" xlink:label="rr_ExpenseExampleYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear10" xlink:label="rr_ExpenseExampleYear10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleByYearColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear01" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear03" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear05" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear10" order="5" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedBULLPROFUND" xlink:title="000014 - Schedule - Expense Example {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003059Member" xlink:label="pf4_S000003059Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003059Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012241Member" xlink:label="pf4_C000012241Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008334Member" xlink:label="pf4_C000008334Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008335Member" xlink:label="pf4_C000008335Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012241Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008334Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008335Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionAbstract" xlink:label="rr_ExpenseExampleNoRedemptionAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:ExpenseExampleNoRedemptionAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionAbstract" xlink:label="rr_ExpenseExampleNoRedemptionAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearColumnName" xlink:label="rr_ExpenseExampleNoRedemptionByYearColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear01" xlink:label="rr_ExpenseExampleNoRedemptionYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear03" xlink:label="rr_ExpenseExampleNoRedemptionYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear05" xlink:label="rr_ExpenseExampleNoRedemptionYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear10" xlink:label="rr_ExpenseExampleNoRedemptionYear10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionByYearColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear01" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear03" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear05" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear10" order="5" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedBULLPROFUND" xlink:title="000015 - Schedule - Expense Example, No Redemption {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003059Member" xlink:label="pf4_S000003059Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003059Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012241Member" xlink:label="pf4_C000012241Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008334Member" xlink:label="pf4_C000008334Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008335Member" xlink:label="pf4_C000008335Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012241Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008334Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008335Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableAbstract" xlink:label="rr_BarChartTableAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:BarChartTableAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableAbstract" xlink:label="rr_BarChartTableAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnCaption" xlink:label="rr_AnnualReturnCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnColumnName" xlink:label="rr_AnnualReturnColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnInceptionDate" xlink:label="rr_AnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1990" xlink:label="rr_AnnualReturn1990" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1991" xlink:label="rr_AnnualReturn1991" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1992" xlink:label="rr_AnnualReturn1992" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1993" xlink:label="rr_AnnualReturn1993" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1994" xlink:label="rr_AnnualReturn1994" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1995" xlink:label="rr_AnnualReturn1995" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1996" xlink:label="rr_AnnualReturn1996" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1997" xlink:label="rr_AnnualReturn1997" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1998" xlink:label="rr_AnnualReturn1998" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1999" xlink:label="rr_AnnualReturn1999" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2000" xlink:label="rr_AnnualReturn2000" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2001" xlink:label="rr_AnnualReturn2001" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2002" xlink:label="rr_AnnualReturn2002" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2003" xlink:label="rr_AnnualReturn2003" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2004" xlink:label="rr_AnnualReturn2004" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2005" xlink:label="rr_AnnualReturn2005" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2006" xlink:label="rr_AnnualReturn2006" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2007" xlink:label="rr_AnnualReturn2007" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2008" xlink:label="rr_AnnualReturn2008" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2009" xlink:label="rr_AnnualReturn2009" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2010" xlink:label="rr_AnnualReturn2010" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2011" xlink:label="rr_AnnualReturn2011" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2012" xlink:label="rr_AnnualReturn2012" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2013" xlink:label="rr_AnnualReturn2013" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2014" xlink:label="rr_AnnualReturn2014" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2015" xlink:label="rr_AnnualReturn2015" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2016" xlink:label="rr_AnnualReturn2016" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2017" xlink:label="rr_AnnualReturn2017" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2018" xlink:label="rr_AnnualReturn2018" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2019" xlink:label="rr_AnnualReturn2019" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2020" xlink:label="rr_AnnualReturn2020" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturnCaption" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturnColumnName" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturnInceptionDate" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1990" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1991" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1992" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1993" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1994" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1995" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1996" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1997" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1998" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1999" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2000" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2001" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2002" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2003" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2004" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2005" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2006" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2007" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2008" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2009" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2010" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2011" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2012" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2013" order="27" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2014" order="28" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2015" order="29" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2016" order="30" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2017" order="31" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2018" order="32" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2019" order="33" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2020" order="34" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsBULLPROFUNDBarChart" xlink:title="000016 - Schedule - Annual Total Returns - BULL PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003059Member" xlink:label="pf4_S000003059Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003059Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012241Member" xlink:label="pf4_C000012241Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008334Member" xlink:label="pf4_C000008334Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008335Member" xlink:label="pf4_C000008335Member" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012241Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008334Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008335Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_SAndPFiveHundredMember" xlink:label="pf4_SAndPFiveHundredMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="pf4_SAndPFiveHundredMember" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnAbstract" xlink:label="rr_AverageAnnualReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:AverageAnnualReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnAbstract" xlink:label="rr_AverageAnnualReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnLabel" xlink:label="rr_AverageAnnualReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear01" xlink:label="rr_AverageAnnualReturnYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear05" xlink:label="rr_AverageAnnualReturnYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear10" xlink:label="rr_AverageAnnualReturnYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnSinceInception" xlink:label="rr_AverageAnnualReturnSinceInception" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnInceptionDate" xlink:label="rr_AverageAnnualReturnInceptionDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnLabel" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear01" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear05" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear10" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnSinceInception" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnInceptionDate" order="6" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBULLPROFUND" xlink:title="000017 - Schedule - Average Annual Total Returns {Transposed} {- BULL PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003059Member" xlink:label="pf4_S000003059Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003059Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012241Member" xlink:label="pf4_C000012241Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008334Member" xlink:label="pf4_C000008334Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008335Member" xlink:label="pf4_C000008335Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012241Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008334Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008335Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnDetailTableTextBlock" xlink:label="rr_RiskReturnDetailTableTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnDetailTableTextBlock" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledBULLPROFUND" xlink:title="000018 - Document - Risk/Return Detail {Unlabeled} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003059Member" xlink:label="pf4_S000003059Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003059Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_SAndPFiveHundredMember" xlink:label="pf4_SAndPFiveHundredMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="pf4_SAndPFiveHundredMember" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012241Member" xlink:label="pf4_C000012241Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008334Member" xlink:label="pf4_C000008334Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008335Member" xlink:label="pf4_C000008335Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012241Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008334Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008335Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusDate" xlink:label="rr_ProspectusDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnHeading" xlink:label="rr_RiskReturnHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveHeading" xlink:label="rr_ObjectiveHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectivePrimaryTextBlock" xlink:label="rr_ObjectivePrimaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveSecondaryTextBlock" xlink:label="rr_ObjectiveSecondaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseHeading" xlink:label="rr_ExpenseHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseNarrativeTextBlock" xlink:label="rr_ExpenseNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesCaption" xlink:label="rr_ShareholderFeesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesColumnName" xlink:label="rr_ShareholderFeesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOfferingPrice" xlink:label="rr_MaximumCumulativeSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOther" xlink:label="rr_MaximumCumulativeSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" xlink:label="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOfferingPrice" xlink:label="rr_MaximumDeferredSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOther" xlink:label="rr_MaximumDeferredSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" xlink:label="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFeeOverRedemption" xlink:label="rr_RedemptionFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFee" xlink:label="rr_RedemptionFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFeeOverRedemption" xlink:label="rr_ExchangeFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFee" xlink:label="rr_ExchangeFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFeeOverAssets" xlink:label="rr_MaximumAccountFeeOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFee" xlink:label="rr_MaximumAccountFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeeOther" xlink:label="rr_ShareholderFeeOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesCaption" xlink:label="rr_OperatingExpensesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesColumnName" xlink:label="rr_OperatingExpensesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ManagementFeesOverAssets" xlink:label="rr_ManagementFeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionAndService12b1FeesOverAssets" xlink:label="rr_DistributionAndService12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionOrSimilarNon12b1FeesOverAssets" xlink:label="rr_DistributionOrSimilarNon12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component1OtherExpensesOverAssets" xlink:label="rr_Component1OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component2OtherExpensesOverAssets" xlink:label="rr_Component2OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component3OtherExpensesOverAssets" xlink:label="rr_Component3OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesOverAssets" xlink:label="rr_OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AcquiredFundFeesAndExpensesOverAssets" xlink:label="rr_AcquiredFundFeesAndExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOverAssets" xlink:label="rr_ExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssets" xlink:label="rr_FeeWaiverOrReimbursementOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_NetExpensesOverAssets" xlink:label="rr_NetExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" xlink:label="rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverHeading" xlink:label="rr_PortfolioTurnoverHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverTextBlock" xlink:label="rr_PortfolioTurnoverTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverRate" xlink:label="rr_PortfolioTurnoverRate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseFootnotesTextBlock" xlink:label="rr_ExpenseFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesDeferredChargesTextBlock" xlink:label="rr_ExpensesDeferredChargesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRangeOfExchangeFeesTextBlock" xlink:label="rr_ExpensesRangeOfExchangeFeesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseBreakpointDiscounts" xlink:label="rr_ExpenseBreakpointDiscounts" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseBreakpointMinimumInvestmentRequiredAmount" xlink:label="rr_ExpenseBreakpointMinimumInvestmentRequiredAmount" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExchangeTradedFundCommissions" xlink:label="rr_ExpenseExchangeTradedFundCommissions" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRepresentBothMasterAndFeeder" xlink:label="rr_ExpensesRepresentBothMasterAndFeeder" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesExplanationOfNonrecurringAccountFee" xlink:label="rr_ExpensesExplanationOfNonrecurringAccountFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesNewFundBasedOnEstimates" xlink:label="rr_OtherExpensesNewFundBasedOnEstimates" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AcquiredFundFeesAndExpensesBasedOnEstimates" xlink:label="rr_AcquiredFundFeesAndExpensesBasedOnEstimates" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded" xlink:label="rr_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRestatedToReflectCurrent" xlink:label="rr_ExpensesRestatedToReflectCurrent" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees" xlink:label="rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleHeading" xlink:label="rr_ExpenseExampleHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearHeading" xlink:label="rr_ExpenseExampleByYearHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNarrativeTextBlock" xlink:label="rr_ExpenseExampleNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearCaption" xlink:label="rr_ExpenseExampleByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear01" xlink:label="rr_ExpenseExampleYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear03" xlink:label="rr_ExpenseExampleYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear05" xlink:label="rr_ExpenseExampleYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear10" xlink:label="rr_ExpenseExampleYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionNarrativeTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearCaption" xlink:label="rr_ExpenseExampleNoRedemptionByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear01" xlink:label="rr_ExpenseExampleNoRedemptionYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear03" xlink:label="rr_ExpenseExampleNoRedemptionYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear05" xlink:label="rr_ExpenseExampleNoRedemptionYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear10" xlink:label="rr_ExpenseExampleNoRedemptionYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleFootnotesTextBlock" xlink:label="rr_ExpenseExampleFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleClosingTextBlock" xlink:label="rr_ExpenseExampleClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyHeading" xlink:label="rr_StrategyHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyNarrativeTextBlock" xlink:label="rr_StrategyNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyPortfolioConcentration" xlink:label="rr_StrategyPortfolioConcentration" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskHeading" xlink:label="rr_RiskHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNarrativeTextBlock" xlink:label="rr_RiskNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskFootnotesTextBlock" xlink:label="rr_RiskFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskClosingTextBlock" xlink:label="rr_RiskClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskLoseMoney" xlink:label="rr_RiskLoseMoney" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNondiversifiedStatus" xlink:label="rr_RiskNondiversifiedStatus" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskMoneyMarketFund" xlink:label="rr_RiskMoneyMarketFund" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNotInsuredDepositoryInstitution" xlink:label="rr_RiskNotInsuredDepositoryInstitution" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskCaption" xlink:label="rr_RiskCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskColumnName" xlink:label="rr_RiskColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Risk" xlink:label="rr_Risk" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartAndPerformanceTableHeading" xlink:label="rr_BarChartAndPerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceNarrativeTextBlock" xlink:label="rr_PerformanceNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceInformationIllustratesVariabilityOfReturns" xlink:label="rr_PerformanceInformationIllustratesVariabilityOfReturns" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceOneYearOrLess" xlink:label="rr_PerformanceOneYearOrLess" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAdditionalMarketIndex" xlink:label="rr_PerformanceAdditionalMarketIndex" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAvailabilityPhone" xlink:label="rr_PerformanceAvailabilityPhone" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAvailabilityWebSiteAddress" xlink:label="rr_PerformanceAvailabilityWebSiteAddress" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformancePastDoesNotIndicateFuture" xlink:label="rr_PerformancePastDoesNotIndicateFuture" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHeading" xlink:label="rr_BarChartHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartNarrativeTextBlock" xlink:label="rr_BarChartNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartDoesNotReflectSalesLoads" xlink:label="rr_BarChartDoesNotReflectSalesLoads" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnCaption" xlink:label="rr_AnnualReturnCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnColumnName" xlink:label="rr_AnnualReturnColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnInceptionDate" xlink:label="rr_AnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1990" xlink:label="rr_AnnualReturn1990" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1991" xlink:label="rr_AnnualReturn1991" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1992" xlink:label="rr_AnnualReturn1992" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1993" xlink:label="rr_AnnualReturn1993" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1994" xlink:label="rr_AnnualReturn1994" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1995" xlink:label="rr_AnnualReturn1995" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1996" xlink:label="rr_AnnualReturn1996" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1997" xlink:label="rr_AnnualReturn1997" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1998" xlink:label="rr_AnnualReturn1998" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1999" xlink:label="rr_AnnualReturn1999" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2000" xlink:label="rr_AnnualReturn2000" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2001" xlink:label="rr_AnnualReturn2001" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2002" xlink:label="rr_AnnualReturn2002" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2003" xlink:label="rr_AnnualReturn2003" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2004" xlink:label="rr_AnnualReturn2004" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2005" xlink:label="rr_AnnualReturn2005" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2006" xlink:label="rr_AnnualReturn2006" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2007" xlink:label="rr_AnnualReturn2007" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2008" xlink:label="rr_AnnualReturn2008" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2009" xlink:label="rr_AnnualReturn2009" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2010" xlink:label="rr_AnnualReturn2010" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2011" xlink:label="rr_AnnualReturn2011" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2012" xlink:label="rr_AnnualReturn2012" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2013" xlink:label="rr_AnnualReturn2013" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2014" xlink:label="rr_AnnualReturn2014" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2015" xlink:label="rr_AnnualReturn2015" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2016" xlink:label="rr_AnnualReturn2016" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2017" xlink:label="rr_AnnualReturn2017" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2018" xlink:label="rr_AnnualReturn2018" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2019" xlink:label="rr_AnnualReturn2019" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2020" xlink:label="rr_AnnualReturn2020" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartFootnotesTextBlock" xlink:label="rr_BarChartFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartClosingTextBlock" xlink:label="rr_BarChartClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod" xlink:label="rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartReturnsForClassNotOfferedInProspectus" xlink:label="rr_BarChartReturnsForClassNotOfferedInProspectus" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_YearToDateReturnLabel" xlink:label="rr_YearToDateReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartYearToDateReturnDate" xlink:label="rr_BarChartYearToDateReturnDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartYearToDateReturn" xlink:label="rr_BarChartYearToDateReturn" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_HighestQuarterlyReturnLabel" xlink:label="rr_HighestQuarterlyReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHighestQuarterlyReturnDate" xlink:label="rr_BarChartHighestQuarterlyReturnDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHighestQuarterlyReturn" xlink:label="rr_BarChartHighestQuarterlyReturn" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_LowestQuarterlyReturnLabel" xlink:label="rr_LowestQuarterlyReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartLowestQuarterlyReturnDate" xlink:label="rr_BarChartLowestQuarterlyReturnDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartLowestQuarterlyReturn" xlink:label="rr_BarChartLowestQuarterlyReturn" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableHeading" xlink:label="rr_PerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableDoesReflectSalesLoads" xlink:label="rr_PerformanceTableDoesReflectSalesLoads" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableMarketIndexChanged" xlink:label="rr_PerformanceTableMarketIndexChanged" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_IndexNoDeductionForFeesExpensesTaxes" xlink:label="rr_IndexNoDeductionForFeesExpensesTaxes" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableUsesHighestFederalRate" xlink:label="rr_PerformanceTableUsesHighestFederalRate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNotRelevantToTaxDeferred" xlink:label="rr_PerformanceTableNotRelevantToTaxDeferred" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableOneClassOfAfterTaxShown" xlink:label="rr_PerformanceTableOneClassOfAfterTaxShown" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableExplanationAfterTaxHigher" xlink:label="rr_PerformanceTableExplanationAfterTaxHigher" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNarrativeTextBlock" xlink:label="rr_PerformanceTableNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod" xlink:label="rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesTextBlock" xlink:label="rr_PerformanceTableFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableClosingTextBlock" xlink:label="rr_PerformanceTableClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnCaption" xlink:label="rr_AverageAnnualReturnCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnColumnName" xlink:label="rr_AverageAnnualReturnColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnLabel" xlink:label="rr_AverageAnnualReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear01" xlink:label="rr_AverageAnnualReturnYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear05" xlink:label="rr_AverageAnnualReturnYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear10" xlink:label="rr_AverageAnnualReturnYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnSinceInception" xlink:label="rr_AverageAnnualReturnSinceInception" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnInceptionDate" xlink:label="rr_AverageAnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYieldCaption" xlink:label="rr_MoneyMarketSevenDayYieldCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYieldColumnName" xlink:label="rr_MoneyMarketSevenDayYieldColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYieldPhone" xlink:label="rr_MoneyMarketSevenDayYieldPhone" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYield" xlink:label="rr_MoneyMarketSevenDayYield" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayTaxEquivalentYield" xlink:label="rr_MoneyMarketSevenDayTaxEquivalentYield" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYieldCaption" xlink:label="rr_ThirtyDayYieldCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYieldColumnName" xlink:label="rr_ThirtyDayYieldColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYieldPhone" xlink:label="rr_ThirtyDayYieldPhone" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYield" xlink:label="rr_ThirtyDayYield" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayTaxEquivalentYield" xlink:label="rr_ThirtyDayTaxEquivalentYield" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_EntityRegistrantName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusDate" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnHeading" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveHeading" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectivePrimaryTextBlock" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveSecondaryTextBlock" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseHeading" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseNarrativeTextBlock" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesCaption" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesColumnName" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOfferingPrice" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOther" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOfferingPrice" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOther" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RedemptionFeeOverRedemption" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RedemptionFee" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExchangeFeeOverRedemption" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExchangeFee" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumAccountFeeOverAssets" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumAccountFee" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeeOther" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesCaption" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesColumnName" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ManagementFeesOverAssets" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_DistributionAndService12b1FeesOverAssets" order="27" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_DistributionOrSimilarNon12b1FeesOverAssets" order="28" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Component1OtherExpensesOverAssets" order="29" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Component2OtherExpensesOverAssets" order="30" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Component3OtherExpensesOverAssets" order="31" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OtherExpensesOverAssets" order="32" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AcquiredFundFeesAndExpensesOverAssets" order="33" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesOverAssets" order="34" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssets" order="35" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_NetExpensesOverAssets" order="36" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" order="37" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverHeading" order="38" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverTextBlock" order="39" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverRate" order="40" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseFootnotesTextBlock" order="41" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesDeferredChargesTextBlock" order="42" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRangeOfExchangeFeesTextBlock" order="43" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseBreakpointDiscounts" order="44" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseBreakpointMinimumInvestmentRequiredAmount" order="45" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExchangeTradedFundCommissions" order="46" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRepresentBothMasterAndFeeder" order="47" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesExplanationOfNonrecurringAccountFee" order="48" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OtherExpensesNewFundBasedOnEstimates" order="49" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AcquiredFundFeesAndExpensesBasedOnEstimates" order="50" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded" order="51" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRestatedToReflectCurrent" order="52" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees" order="53" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleHeading" order="54" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearHeading" order="55" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNarrativeTextBlock" order="56" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearCaption" order="57" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear01" order="58" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear03" order="59" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear05" order="60" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear10" order="61" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" order="62" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionByYearCaption" order="63" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear01" order="64" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear03" order="65" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear05" order="66" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear10" order="67" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleFootnotesTextBlock" order="68" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleClosingTextBlock" order="69" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyHeading" order="70" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyNarrativeTextBlock" order="71" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyPortfolioConcentration" order="72" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskHeading" order="73" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNarrativeTextBlock" order="74" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskFootnotesTextBlock" order="75" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskClosingTextBlock" order="76" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskLoseMoney" order="77" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNondiversifiedStatus" order="78" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskMoneyMarketFund" order="79" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNotInsuredDepositoryInstitution" order="80" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskCaption" order="81" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskColumnName" order="82" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Risk" order="83" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartAndPerformanceTableHeading" order="84" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceNarrativeTextBlock" order="85" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceInformationIllustratesVariabilityOfReturns" order="86" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceOneYearOrLess" order="87" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAdditionalMarketIndex" order="88" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAvailabilityPhone" order="89" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAvailabilityWebSiteAddress" order="90" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformancePastDoesNotIndicateFuture" order="91" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHeading" order="92" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartNarrativeTextBlock" order="93" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartDoesNotReflectSalesLoads" order="94" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturnCaption" order="95" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturnColumnName" order="96" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturnInceptionDate" order="97" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1990" order="98" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1991" order="99" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1992" order="100" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1993" order="101" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1994" order="102" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1995" order="103" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1996" order="104" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1997" order="105" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1998" order="106" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1999" order="107" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2000" order="108" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2001" order="109" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2002" order="110" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2003" order="111" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2004" order="112" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2005" order="113" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2006" order="114" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2007" order="115" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2008" order="116" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2009" order="117" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2010" order="118" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2011" order="119" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2012" order="120" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2013" order="121" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2014" order="122" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2015" order="123" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2016" order="124" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2017" order="125" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2018" order="126" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2019" order="127" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2020" order="128" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartFootnotesTextBlock" order="129" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartClosingTextBlock" order="130" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod" order="131" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartReturnsForClassNotOfferedInProspectus" order="132" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_YearToDateReturnLabel" order="133" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartYearToDateReturnDate" order="134" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartYearToDateReturn" order="135" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_HighestQuarterlyReturnLabel" order="136" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHighestQuarterlyReturnDate" order="137" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHighestQuarterlyReturn" order="138" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_LowestQuarterlyReturnLabel" order="139" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartLowestQuarterlyReturnDate" order="140" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartLowestQuarterlyReturn" order="141" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableHeading" order="142" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableDoesReflectSalesLoads" order="143" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableMarketIndexChanged" order="144" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_IndexNoDeductionForFeesExpensesTaxes" order="145" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableUsesHighestFederalRate" order="146" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNotRelevantToTaxDeferred" order="147" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableOneClassOfAfterTaxShown" order="148" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableExplanationAfterTaxHigher" order="149" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNarrativeTextBlock" order="150" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod" order="151" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesTextBlock" order="152" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableClosingTextBlock" order="153" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnCaption" order="154" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnColumnName" order="155" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnLabel" order="156" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear01" order="157" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear05" order="158" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear10" order="159" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnSinceInception" order="160" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnInceptionDate" order="161" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYieldCaption" order="162" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYieldColumnName" order="163" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYieldPhone" order="164" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYield" order="165" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayTaxEquivalentYield" order="166" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYieldCaption" order="167" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYieldColumnName" order="168" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYieldPhone" order="169" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYield" order="170" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayTaxEquivalentYield" order="171" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsBULLPROFUND" xlink:title="000019 - Disclosure - Risk/Return Detail Data {Elements} - BULL PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003068Member" xlink:label="pf4_S000003068Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003068Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012250Member" xlink:label="pf4_C000012250Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008352Member" xlink:label="pf4_C000008352Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008353Member" xlink:label="pf4_C000008353Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012250Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008352Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008353Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnHeading" xlink:label="rr_RiskReturnHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveHeading" xlink:label="rr_ObjectiveHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectivePrimaryTextBlock" xlink:label="rr_ObjectivePrimaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveSecondaryTextBlock" xlink:label="rr_ObjectiveSecondaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseHeading" xlink:label="rr_ExpenseHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseNarrativeTextBlock" xlink:label="rr_ExpenseNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesCaption" xlink:label="rr_ShareholderFeesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesTableTextBlock" xlink:label="rr_ShareholderFeesTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesCaption" xlink:label="rr_OperatingExpensesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualFundOperatingExpensesTableTextBlock" xlink:label="rr_AnnualFundOperatingExpensesTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseFootnotesTextBlock" xlink:label="rr_ExpenseFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesDeferredChargesTextBlock" xlink:label="rr_ExpensesDeferredChargesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRangeOfExchangeFeesTextBlock" xlink:label="rr_ExpensesRangeOfExchangeFeesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleHeading" xlink:label="rr_ExpenseExampleHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearHeading" xlink:label="rr_ExpenseExampleByYearHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNarrativeTextBlock" xlink:label="rr_ExpenseExampleNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearCaption" xlink:label="rr_ExpenseExampleByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleWithRedemptionTableTextBlock" xlink:label="rr_ExpenseExampleWithRedemptionTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionNarrativeTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearCaption" xlink:label="rr_ExpenseExampleNoRedemptionByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionTableTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleFootnotesTextBlock" xlink:label="rr_ExpenseExampleFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleClosingTextBlock" xlink:label="rr_ExpenseExampleClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverHeading" xlink:label="rr_PortfolioTurnoverHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverTextBlock" xlink:label="rr_PortfolioTurnoverTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyHeading" xlink:label="rr_StrategyHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyNarrativeTextBlock" xlink:label="rr_StrategyNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskHeading" xlink:label="rr_RiskHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNarrativeTextBlock" xlink:label="rr_RiskNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskFootnotesTextBlock" xlink:label="rr_RiskFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskClosingTextBlock" xlink:label="rr_RiskClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartAndPerformanceTableHeading" xlink:label="rr_BarChartAndPerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceNarrativeTextBlock" xlink:label="rr_PerformanceNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartNarrativeTextBlock" xlink:label="rr_BarChartNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHeading" xlink:label="rr_BarChartHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableTextBlock" xlink:label="rr_BarChartTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartFootnotesTextBlock" xlink:label="rr_BarChartFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartClosingTextBlock" xlink:label="rr_BarChartClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableHeading" xlink:label="rr_PerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableTextBlock" xlink:label="rr_PerformanceTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNarrativeTextBlock" xlink:label="rr_PerformanceTableNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MarketIndexPerformanceTableTextBlock" xlink:label="rr_MarketIndexPerformanceTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesTextBlock" xlink:label="rr_PerformanceTableFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableClosingTextBlock" xlink:label="rr_PerformanceTableClosingTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnHeading" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveHeading" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectivePrimaryTextBlock" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveSecondaryTextBlock" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseHeading" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseNarrativeTextBlock" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesCaption" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesTableTextBlock" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesCaption" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualFundOperatingExpensesTableTextBlock" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseFootnotesTextBlock" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesDeferredChargesTextBlock" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRangeOfExchangeFeesTextBlock" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleHeading" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearHeading" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNarrativeTextBlock" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearCaption" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleWithRedemptionTableTextBlock" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionByYearCaption" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionTableTextBlock" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleFootnotesTextBlock" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleClosingTextBlock" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverHeading" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverTextBlock" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyHeading" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyNarrativeTextBlock" order="27" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskHeading" order="28" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNarrativeTextBlock" order="29" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskFootnotesTextBlock" order="30" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskClosingTextBlock" order="31" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartAndPerformanceTableHeading" order="32" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceNarrativeTextBlock" order="33" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartNarrativeTextBlock" order="34" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHeading" order="35" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartTableTextBlock" order="36" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartFootnotesTextBlock" order="37" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartClosingTextBlock" order="38" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableHeading" order="39" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableTextBlock" order="40" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNarrativeTextBlock" order="41" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MarketIndexPerformanceTableTextBlock" order="42" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesTextBlock" order="43" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableClosingTextBlock" order="44" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledMID-CAPPROFUND" xlink:title="000021 - Document - Risk/Return Summary {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003068Member" xlink:label="pf4_S000003068Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003068Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012250Member" xlink:label="pf4_C000012250Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008352Member" xlink:label="pf4_C000008352Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008353Member" xlink:label="pf4_C000008353Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012250Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008352Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008353Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesAbstract" xlink:label="rr_ShareholderFeesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:ShareholderFeesAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesAbstract" xlink:label="rr_ShareholderFeesAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesColumnName" xlink:label="rr_ShareholderFeesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOfferingPrice" xlink:label="rr_MaximumCumulativeSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOther" xlink:label="rr_MaximumCumulativeSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" xlink:label="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOfferingPrice" xlink:label="rr_MaximumDeferredSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOther" xlink:label="rr_MaximumDeferredSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" xlink:label="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFeeOverRedemption" xlink:label="rr_RedemptionFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFee" xlink:label="rr_RedemptionFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFeeOverRedemption" xlink:label="rr_ExchangeFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFee" xlink:label="rr_ExchangeFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFeeOverAssets" xlink:label="rr_MaximumAccountFeeOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFee" xlink:label="rr_MaximumAccountFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeeOther" xlink:label="rr_ShareholderFeeOther" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ShareholderFeesColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOfferingPrice" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOther" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOfferingPrice" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOther" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_RedemptionFeeOverRedemption" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_RedemptionFee" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ExchangeFeeOverRedemption" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ExchangeFee" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumAccountFeeOverAssets" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumAccountFee" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ShareholderFeeOther" order="14" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesMID-CAPPROFUND" xlink:title="000022 - Schedule - Shareholder Fees {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003068Member" xlink:label="pf4_S000003068Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003068Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012250Member" xlink:label="pf4_C000012250Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008352Member" xlink:label="pf4_C000008352Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008353Member" xlink:label="pf4_C000008353Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012250Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008352Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008353Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesAbstract" xlink:label="rr_OperatingExpensesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:OperatingExpensesAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesAbstract" xlink:label="rr_OperatingExpensesAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesColumnName" xlink:label="rr_OperatingExpensesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ManagementFeesOverAssets" xlink:label="rr_ManagementFeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionAndService12b1FeesOverAssets" xlink:label="rr_DistributionAndService12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionOrSimilarNon12b1FeesOverAssets" xlink:label="rr_DistributionOrSimilarNon12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component1OtherExpensesOverAssets" xlink:label="rr_Component1OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component2OtherExpensesOverAssets" xlink:label="rr_Component2OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component3OtherExpensesOverAssets" xlink:label="rr_Component3OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesOverAssets" xlink:label="rr_OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AcquiredFundFeesAndExpensesOverAssets" xlink:label="rr_AcquiredFundFeesAndExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOverAssets" xlink:label="rr_ExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssets" xlink:label="rr_FeeWaiverOrReimbursementOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_NetExpensesOverAssets" xlink:label="rr_NetExpensesOverAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_OperatingExpensesColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ManagementFeesOverAssets" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_DistributionAndService12b1FeesOverAssets" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_DistributionOrSimilarNon12b1FeesOverAssets" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_Component1OtherExpensesOverAssets" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_Component2OtherExpensesOverAssets" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_Component3OtherExpensesOverAssets" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_OtherExpensesOverAssets" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_AcquiredFundFeesAndExpensesOverAssets" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ExpensesOverAssets" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssets" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_NetExpensesOverAssets" order="12" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesMID-CAPPROFUND" xlink:title="000023 - Schedule - Annual Fund Operating Expenses {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003068Member" xlink:label="pf4_S000003068Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003068Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012250Member" xlink:label="pf4_C000012250Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008352Member" xlink:label="pf4_C000008352Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008353Member" xlink:label="pf4_C000008353Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012250Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008352Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008353Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleAbstract" xlink:label="rr_ExpenseExampleAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:ExpenseExampleAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleAbstract" xlink:label="rr_ExpenseExampleAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearColumnName" xlink:label="rr_ExpenseExampleByYearColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear01" xlink:label="rr_ExpenseExampleYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear03" xlink:label="rr_ExpenseExampleYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear05" xlink:label="rr_ExpenseExampleYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear10" xlink:label="rr_ExpenseExampleYear10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleByYearColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear01" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear03" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear05" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear10" order="5" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedMID-CAPPROFUND" xlink:title="000024 - Schedule - Expense Example {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003068Member" xlink:label="pf4_S000003068Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003068Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012250Member" xlink:label="pf4_C000012250Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008352Member" xlink:label="pf4_C000008352Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008353Member" xlink:label="pf4_C000008353Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012250Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008352Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008353Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionAbstract" xlink:label="rr_ExpenseExampleNoRedemptionAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:ExpenseExampleNoRedemptionAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionAbstract" xlink:label="rr_ExpenseExampleNoRedemptionAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearColumnName" xlink:label="rr_ExpenseExampleNoRedemptionByYearColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear01" xlink:label="rr_ExpenseExampleNoRedemptionYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear03" xlink:label="rr_ExpenseExampleNoRedemptionYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear05" xlink:label="rr_ExpenseExampleNoRedemptionYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear10" xlink:label="rr_ExpenseExampleNoRedemptionYear10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionByYearColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear01" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear03" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear05" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear10" order="5" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedMID-CAPPROFUND" xlink:title="000025 - Schedule - Expense Example, No Redemption {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003068Member" xlink:label="pf4_S000003068Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003068Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012250Member" xlink:label="pf4_C000012250Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008352Member" xlink:label="pf4_C000008352Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008353Member" xlink:label="pf4_C000008353Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012250Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008352Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008353Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableAbstract" xlink:label="rr_BarChartTableAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:BarChartTableAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableAbstract" xlink:label="rr_BarChartTableAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnCaption" xlink:label="rr_AnnualReturnCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnColumnName" xlink:label="rr_AnnualReturnColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnInceptionDate" xlink:label="rr_AnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1990" xlink:label="rr_AnnualReturn1990" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1991" xlink:label="rr_AnnualReturn1991" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1992" xlink:label="rr_AnnualReturn1992" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1993" xlink:label="rr_AnnualReturn1993" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1994" xlink:label="rr_AnnualReturn1994" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1995" xlink:label="rr_AnnualReturn1995" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1996" xlink:label="rr_AnnualReturn1996" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1997" xlink:label="rr_AnnualReturn1997" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1998" xlink:label="rr_AnnualReturn1998" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1999" xlink:label="rr_AnnualReturn1999" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2000" xlink:label="rr_AnnualReturn2000" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2001" xlink:label="rr_AnnualReturn2001" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2002" xlink:label="rr_AnnualReturn2002" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2003" xlink:label="rr_AnnualReturn2003" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2004" xlink:label="rr_AnnualReturn2004" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2005" xlink:label="rr_AnnualReturn2005" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2006" xlink:label="rr_AnnualReturn2006" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2007" xlink:label="rr_AnnualReturn2007" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2008" xlink:label="rr_AnnualReturn2008" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2009" xlink:label="rr_AnnualReturn2009" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2010" xlink:label="rr_AnnualReturn2010" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2011" xlink:label="rr_AnnualReturn2011" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2012" xlink:label="rr_AnnualReturn2012" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2013" xlink:label="rr_AnnualReturn2013" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2014" xlink:label="rr_AnnualReturn2014" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2015" xlink:label="rr_AnnualReturn2015" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2016" xlink:label="rr_AnnualReturn2016" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2017" xlink:label="rr_AnnualReturn2017" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2018" xlink:label="rr_AnnualReturn2018" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2019" xlink:label="rr_AnnualReturn2019" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2020" xlink:label="rr_AnnualReturn2020" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturnCaption" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturnColumnName" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturnInceptionDate" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1990" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1991" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1992" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1993" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1994" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1995" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1996" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1997" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1998" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1999" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2000" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2001" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2002" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2003" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2004" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2005" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2006" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2007" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2008" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2009" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2010" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2011" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2012" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2013" order="27" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2014" order="28" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2015" order="29" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2016" order="30" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2017" order="31" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2018" order="32" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2019" order="33" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2020" order="34" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsMID-CAPPROFUNDBarChart" xlink:title="000026 - Schedule - Annual Total Returns - MID-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003068Member" xlink:label="pf4_S000003068Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003068Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012250Member" xlink:label="pf4_C000012250Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008352Member" xlink:label="pf4_C000008352Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008353Member" xlink:label="pf4_C000008353Member" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012250Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008352Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008353Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_SAndPMidCapFourHundredValueIndexMember" xlink:label="pf4_SAndPMidCapFourHundredValueIndexMember" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_SAndPMidcapFourHundredMember" xlink:label="pf4_SAndPMidcapFourHundredMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="pf4_SAndPMidCapFourHundredValueIndexMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="pf4_SAndPMidcapFourHundredMember" order="5" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnAbstract" xlink:label="rr_AverageAnnualReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:AverageAnnualReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnAbstract" xlink:label="rr_AverageAnnualReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnLabel" xlink:label="rr_AverageAnnualReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear01" xlink:label="rr_AverageAnnualReturnYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear05" xlink:label="rr_AverageAnnualReturnYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear10" xlink:label="rr_AverageAnnualReturnYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnSinceInception" xlink:label="rr_AverageAnnualReturnSinceInception" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnInceptionDate" xlink:label="rr_AverageAnnualReturnInceptionDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnLabel" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear01" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear05" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear10" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnSinceInception" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnInceptionDate" order="6" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedMID-CAPPROFUND" xlink:title="000027 - Schedule - Average Annual Total Returns {Transposed} {- MID-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003068Member" xlink:label="pf4_S000003068Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003068Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012250Member" xlink:label="pf4_C000012250Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008352Member" xlink:label="pf4_C000008352Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008353Member" xlink:label="pf4_C000008353Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012250Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008352Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008353Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnDetailTableTextBlock" xlink:label="rr_RiskReturnDetailTableTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnDetailTableTextBlock" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledMID-CAPPROFUND" xlink:title="000028 - Document - Risk/Return Detail {Unlabeled} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003068Member" xlink:label="pf4_S000003068Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003068Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_SAndPMidCapFourHundredValueIndexMember" xlink:label="pf4_SAndPMidCapFourHundredValueIndexMember" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_SAndPMidcapFourHundredMember" xlink:label="pf4_SAndPMidcapFourHundredMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="pf4_SAndPMidCapFourHundredValueIndexMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="pf4_SAndPMidcapFourHundredMember" order="5" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012250Member" xlink:label="pf4_C000012250Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008352Member" xlink:label="pf4_C000008352Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008353Member" xlink:label="pf4_C000008353Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012250Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008352Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008353Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusDate" xlink:label="rr_ProspectusDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnHeading" xlink:label="rr_RiskReturnHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveHeading" xlink:label="rr_ObjectiveHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectivePrimaryTextBlock" xlink:label="rr_ObjectivePrimaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveSecondaryTextBlock" xlink:label="rr_ObjectiveSecondaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseHeading" xlink:label="rr_ExpenseHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseNarrativeTextBlock" xlink:label="rr_ExpenseNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesCaption" xlink:label="rr_ShareholderFeesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesColumnName" xlink:label="rr_ShareholderFeesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOfferingPrice" xlink:label="rr_MaximumCumulativeSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOther" xlink:label="rr_MaximumCumulativeSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" xlink:label="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOfferingPrice" xlink:label="rr_MaximumDeferredSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOther" xlink:label="rr_MaximumDeferredSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" xlink:label="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFeeOverRedemption" xlink:label="rr_RedemptionFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFee" xlink:label="rr_RedemptionFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFeeOverRedemption" xlink:label="rr_ExchangeFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFee" xlink:label="rr_ExchangeFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFeeOverAssets" xlink:label="rr_MaximumAccountFeeOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFee" xlink:label="rr_MaximumAccountFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeeOther" xlink:label="rr_ShareholderFeeOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesCaption" xlink:label="rr_OperatingExpensesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesColumnName" xlink:label="rr_OperatingExpensesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ManagementFeesOverAssets" xlink:label="rr_ManagementFeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionAndService12b1FeesOverAssets" xlink:label="rr_DistributionAndService12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionOrSimilarNon12b1FeesOverAssets" xlink:label="rr_DistributionOrSimilarNon12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component1OtherExpensesOverAssets" xlink:label="rr_Component1OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component2OtherExpensesOverAssets" xlink:label="rr_Component2OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component3OtherExpensesOverAssets" xlink:label="rr_Component3OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesOverAssets" xlink:label="rr_OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AcquiredFundFeesAndExpensesOverAssets" xlink:label="rr_AcquiredFundFeesAndExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOverAssets" xlink:label="rr_ExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssets" xlink:label="rr_FeeWaiverOrReimbursementOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_NetExpensesOverAssets" xlink:label="rr_NetExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" xlink:label="rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverHeading" xlink:label="rr_PortfolioTurnoverHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverTextBlock" xlink:label="rr_PortfolioTurnoverTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverRate" xlink:label="rr_PortfolioTurnoverRate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseFootnotesTextBlock" xlink:label="rr_ExpenseFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesDeferredChargesTextBlock" xlink:label="rr_ExpensesDeferredChargesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRangeOfExchangeFeesTextBlock" xlink:label="rr_ExpensesRangeOfExchangeFeesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseBreakpointDiscounts" xlink:label="rr_ExpenseBreakpointDiscounts" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseBreakpointMinimumInvestmentRequiredAmount" xlink:label="rr_ExpenseBreakpointMinimumInvestmentRequiredAmount" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExchangeTradedFundCommissions" xlink:label="rr_ExpenseExchangeTradedFundCommissions" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRepresentBothMasterAndFeeder" xlink:label="rr_ExpensesRepresentBothMasterAndFeeder" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesExplanationOfNonrecurringAccountFee" xlink:label="rr_ExpensesExplanationOfNonrecurringAccountFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesNewFundBasedOnEstimates" xlink:label="rr_OtherExpensesNewFundBasedOnEstimates" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AcquiredFundFeesAndExpensesBasedOnEstimates" xlink:label="rr_AcquiredFundFeesAndExpensesBasedOnEstimates" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded" xlink:label="rr_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRestatedToReflectCurrent" xlink:label="rr_ExpensesRestatedToReflectCurrent" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees" xlink:label="rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleHeading" xlink:label="rr_ExpenseExampleHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearHeading" xlink:label="rr_ExpenseExampleByYearHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNarrativeTextBlock" xlink:label="rr_ExpenseExampleNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearCaption" xlink:label="rr_ExpenseExampleByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear01" xlink:label="rr_ExpenseExampleYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear03" xlink:label="rr_ExpenseExampleYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear05" xlink:label="rr_ExpenseExampleYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear10" xlink:label="rr_ExpenseExampleYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionNarrativeTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearCaption" xlink:label="rr_ExpenseExampleNoRedemptionByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear01" xlink:label="rr_ExpenseExampleNoRedemptionYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear03" xlink:label="rr_ExpenseExampleNoRedemptionYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear05" xlink:label="rr_ExpenseExampleNoRedemptionYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear10" xlink:label="rr_ExpenseExampleNoRedemptionYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleFootnotesTextBlock" xlink:label="rr_ExpenseExampleFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleClosingTextBlock" xlink:label="rr_ExpenseExampleClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyHeading" xlink:label="rr_StrategyHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyNarrativeTextBlock" xlink:label="rr_StrategyNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyPortfolioConcentration" xlink:label="rr_StrategyPortfolioConcentration" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskHeading" xlink:label="rr_RiskHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNarrativeTextBlock" xlink:label="rr_RiskNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskFootnotesTextBlock" xlink:label="rr_RiskFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskClosingTextBlock" xlink:label="rr_RiskClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskLoseMoney" xlink:label="rr_RiskLoseMoney" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNondiversifiedStatus" xlink:label="rr_RiskNondiversifiedStatus" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskMoneyMarketFund" xlink:label="rr_RiskMoneyMarketFund" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNotInsuredDepositoryInstitution" xlink:label="rr_RiskNotInsuredDepositoryInstitution" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskCaption" xlink:label="rr_RiskCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskColumnName" xlink:label="rr_RiskColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Risk" xlink:label="rr_Risk" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartAndPerformanceTableHeading" xlink:label="rr_BarChartAndPerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceNarrativeTextBlock" xlink:label="rr_PerformanceNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceInformationIllustratesVariabilityOfReturns" xlink:label="rr_PerformanceInformationIllustratesVariabilityOfReturns" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceOneYearOrLess" xlink:label="rr_PerformanceOneYearOrLess" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAdditionalMarketIndex" xlink:label="rr_PerformanceAdditionalMarketIndex" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAvailabilityPhone" xlink:label="rr_PerformanceAvailabilityPhone" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAvailabilityWebSiteAddress" xlink:label="rr_PerformanceAvailabilityWebSiteAddress" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformancePastDoesNotIndicateFuture" xlink:label="rr_PerformancePastDoesNotIndicateFuture" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHeading" xlink:label="rr_BarChartHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartNarrativeTextBlock" xlink:label="rr_BarChartNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartDoesNotReflectSalesLoads" xlink:label="rr_BarChartDoesNotReflectSalesLoads" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnCaption" xlink:label="rr_AnnualReturnCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnColumnName" xlink:label="rr_AnnualReturnColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnInceptionDate" xlink:label="rr_AnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1990" xlink:label="rr_AnnualReturn1990" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1991" xlink:label="rr_AnnualReturn1991" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1992" xlink:label="rr_AnnualReturn1992" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1993" xlink:label="rr_AnnualReturn1993" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1994" xlink:label="rr_AnnualReturn1994" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1995" xlink:label="rr_AnnualReturn1995" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1996" xlink:label="rr_AnnualReturn1996" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1997" xlink:label="rr_AnnualReturn1997" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1998" xlink:label="rr_AnnualReturn1998" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1999" xlink:label="rr_AnnualReturn1999" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2000" xlink:label="rr_AnnualReturn2000" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2001" xlink:label="rr_AnnualReturn2001" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2002" xlink:label="rr_AnnualReturn2002" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2003" xlink:label="rr_AnnualReturn2003" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2004" xlink:label="rr_AnnualReturn2004" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2005" xlink:label="rr_AnnualReturn2005" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2006" xlink:label="rr_AnnualReturn2006" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2007" xlink:label="rr_AnnualReturn2007" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2008" xlink:label="rr_AnnualReturn2008" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2009" xlink:label="rr_AnnualReturn2009" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2010" xlink:label="rr_AnnualReturn2010" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2011" xlink:label="rr_AnnualReturn2011" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2012" xlink:label="rr_AnnualReturn2012" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2013" xlink:label="rr_AnnualReturn2013" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2014" xlink:label="rr_AnnualReturn2014" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2015" xlink:label="rr_AnnualReturn2015" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2016" xlink:label="rr_AnnualReturn2016" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2017" xlink:label="rr_AnnualReturn2017" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2018" xlink:label="rr_AnnualReturn2018" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2019" xlink:label="rr_AnnualReturn2019" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2020" xlink:label="rr_AnnualReturn2020" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartFootnotesTextBlock" xlink:label="rr_BarChartFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartClosingTextBlock" xlink:label="rr_BarChartClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod" xlink:label="rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartReturnsForClassNotOfferedInProspectus" xlink:label="rr_BarChartReturnsForClassNotOfferedInProspectus" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_YearToDateReturnLabel" xlink:label="rr_YearToDateReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartYearToDateReturnDate" xlink:label="rr_BarChartYearToDateReturnDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartYearToDateReturn" xlink:label="rr_BarChartYearToDateReturn" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_HighestQuarterlyReturnLabel" xlink:label="rr_HighestQuarterlyReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHighestQuarterlyReturnDate" xlink:label="rr_BarChartHighestQuarterlyReturnDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHighestQuarterlyReturn" xlink:label="rr_BarChartHighestQuarterlyReturn" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_LowestQuarterlyReturnLabel" xlink:label="rr_LowestQuarterlyReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartLowestQuarterlyReturnDate" xlink:label="rr_BarChartLowestQuarterlyReturnDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartLowestQuarterlyReturn" xlink:label="rr_BarChartLowestQuarterlyReturn" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableHeading" xlink:label="rr_PerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableDoesReflectSalesLoads" xlink:label="rr_PerformanceTableDoesReflectSalesLoads" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableMarketIndexChanged" xlink:label="rr_PerformanceTableMarketIndexChanged" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_IndexNoDeductionForFeesExpensesTaxes" xlink:label="rr_IndexNoDeductionForFeesExpensesTaxes" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableUsesHighestFederalRate" xlink:label="rr_PerformanceTableUsesHighestFederalRate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNotRelevantToTaxDeferred" xlink:label="rr_PerformanceTableNotRelevantToTaxDeferred" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableOneClassOfAfterTaxShown" xlink:label="rr_PerformanceTableOneClassOfAfterTaxShown" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableExplanationAfterTaxHigher" xlink:label="rr_PerformanceTableExplanationAfterTaxHigher" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNarrativeTextBlock" xlink:label="rr_PerformanceTableNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod" xlink:label="rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesTextBlock" xlink:label="rr_PerformanceTableFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableClosingTextBlock" xlink:label="rr_PerformanceTableClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnCaption" xlink:label="rr_AverageAnnualReturnCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnColumnName" xlink:label="rr_AverageAnnualReturnColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnLabel" xlink:label="rr_AverageAnnualReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear01" xlink:label="rr_AverageAnnualReturnYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear05" xlink:label="rr_AverageAnnualReturnYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear10" xlink:label="rr_AverageAnnualReturnYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnSinceInception" xlink:label="rr_AverageAnnualReturnSinceInception" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnInceptionDate" xlink:label="rr_AverageAnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYieldCaption" xlink:label="rr_MoneyMarketSevenDayYieldCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYieldColumnName" xlink:label="rr_MoneyMarketSevenDayYieldColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYieldPhone" xlink:label="rr_MoneyMarketSevenDayYieldPhone" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYield" xlink:label="rr_MoneyMarketSevenDayYield" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayTaxEquivalentYield" xlink:label="rr_MoneyMarketSevenDayTaxEquivalentYield" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYieldCaption" xlink:label="rr_ThirtyDayYieldCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYieldColumnName" xlink:label="rr_ThirtyDayYieldColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYieldPhone" xlink:label="rr_ThirtyDayYieldPhone" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYield" xlink:label="rr_ThirtyDayYield" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayTaxEquivalentYield" xlink:label="rr_ThirtyDayTaxEquivalentYield" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_EntityRegistrantName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusDate" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnHeading" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveHeading" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectivePrimaryTextBlock" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveSecondaryTextBlock" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseHeading" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseNarrativeTextBlock" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesCaption" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesColumnName" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOfferingPrice" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOther" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOfferingPrice" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOther" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RedemptionFeeOverRedemption" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RedemptionFee" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExchangeFeeOverRedemption" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExchangeFee" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumAccountFeeOverAssets" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumAccountFee" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeeOther" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesCaption" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesColumnName" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ManagementFeesOverAssets" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_DistributionAndService12b1FeesOverAssets" order="27" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_DistributionOrSimilarNon12b1FeesOverAssets" order="28" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Component1OtherExpensesOverAssets" order="29" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Component2OtherExpensesOverAssets" order="30" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Component3OtherExpensesOverAssets" order="31" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OtherExpensesOverAssets" order="32" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AcquiredFundFeesAndExpensesOverAssets" order="33" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesOverAssets" order="34" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssets" order="35" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_NetExpensesOverAssets" order="36" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" order="37" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverHeading" order="38" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverTextBlock" order="39" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverRate" order="40" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseFootnotesTextBlock" order="41" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesDeferredChargesTextBlock" order="42" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRangeOfExchangeFeesTextBlock" order="43" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseBreakpointDiscounts" order="44" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseBreakpointMinimumInvestmentRequiredAmount" order="45" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExchangeTradedFundCommissions" order="46" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRepresentBothMasterAndFeeder" order="47" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesExplanationOfNonrecurringAccountFee" order="48" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OtherExpensesNewFundBasedOnEstimates" order="49" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AcquiredFundFeesAndExpensesBasedOnEstimates" order="50" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded" order="51" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRestatedToReflectCurrent" order="52" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees" order="53" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleHeading" order="54" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearHeading" order="55" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNarrativeTextBlock" order="56" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearCaption" order="57" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear01" order="58" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear03" order="59" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear05" order="60" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear10" order="61" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" order="62" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionByYearCaption" order="63" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear01" order="64" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear03" order="65" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear05" order="66" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear10" order="67" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleFootnotesTextBlock" order="68" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleClosingTextBlock" order="69" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyHeading" order="70" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyNarrativeTextBlock" order="71" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyPortfolioConcentration" order="72" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskHeading" order="73" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNarrativeTextBlock" order="74" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskFootnotesTextBlock" order="75" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskClosingTextBlock" order="76" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskLoseMoney" order="77" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNondiversifiedStatus" order="78" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskMoneyMarketFund" order="79" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNotInsuredDepositoryInstitution" order="80" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskCaption" order="81" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskColumnName" order="82" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Risk" order="83" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartAndPerformanceTableHeading" order="84" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceNarrativeTextBlock" order="85" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceInformationIllustratesVariabilityOfReturns" order="86" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceOneYearOrLess" order="87" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAdditionalMarketIndex" order="88" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAvailabilityPhone" order="89" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAvailabilityWebSiteAddress" order="90" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformancePastDoesNotIndicateFuture" order="91" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHeading" order="92" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartNarrativeTextBlock" order="93" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartDoesNotReflectSalesLoads" order="94" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturnCaption" order="95" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturnColumnName" order="96" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturnInceptionDate" order="97" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1990" order="98" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1991" order="99" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1992" order="100" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1993" order="101" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1994" order="102" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1995" order="103" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1996" order="104" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1997" order="105" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1998" order="106" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1999" order="107" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2000" order="108" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2001" order="109" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2002" order="110" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2003" order="111" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2004" order="112" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2005" order="113" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2006" order="114" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2007" order="115" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2008" order="116" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2009" order="117" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2010" order="118" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2011" order="119" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2012" order="120" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2013" order="121" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2014" order="122" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2015" order="123" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2016" order="124" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2017" order="125" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2018" order="126" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2019" order="127" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2020" order="128" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartFootnotesTextBlock" order="129" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartClosingTextBlock" order="130" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod" order="131" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartReturnsForClassNotOfferedInProspectus" order="132" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_YearToDateReturnLabel" order="133" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartYearToDateReturnDate" order="134" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartYearToDateReturn" order="135" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_HighestQuarterlyReturnLabel" order="136" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHighestQuarterlyReturnDate" order="137" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHighestQuarterlyReturn" order="138" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_LowestQuarterlyReturnLabel" order="139" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartLowestQuarterlyReturnDate" order="140" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartLowestQuarterlyReturn" order="141" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableHeading" order="142" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableDoesReflectSalesLoads" order="143" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableMarketIndexChanged" order="144" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_IndexNoDeductionForFeesExpensesTaxes" order="145" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableUsesHighestFederalRate" order="146" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNotRelevantToTaxDeferred" order="147" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableOneClassOfAfterTaxShown" order="148" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableExplanationAfterTaxHigher" order="149" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNarrativeTextBlock" order="150" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod" order="151" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesTextBlock" order="152" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableClosingTextBlock" order="153" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnCaption" order="154" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnColumnName" order="155" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnLabel" order="156" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear01" order="157" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear05" order="158" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear10" order="159" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnSinceInception" order="160" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnInceptionDate" order="161" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYieldCaption" order="162" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYieldColumnName" order="163" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYieldPhone" order="164" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYield" order="165" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayTaxEquivalentYield" order="166" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYieldCaption" order="167" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYieldColumnName" order="168" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYieldPhone" order="169" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYield" order="170" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayTaxEquivalentYield" order="171" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsMID-CAPPROFUND" xlink:title="000029 - Disclosure - Risk/Return Detail Data {Elements} - MID-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003069Member" xlink:label="pf4_S000003069Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003069Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012251Member" xlink:label="pf4_C000012251Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008354Member" xlink:label="pf4_C000008354Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008355Member" xlink:label="pf4_C000008355Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012251Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008354Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008355Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnHeading" xlink:label="rr_RiskReturnHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveHeading" xlink:label="rr_ObjectiveHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectivePrimaryTextBlock" xlink:label="rr_ObjectivePrimaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveSecondaryTextBlock" xlink:label="rr_ObjectiveSecondaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseHeading" xlink:label="rr_ExpenseHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseNarrativeTextBlock" xlink:label="rr_ExpenseNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesCaption" xlink:label="rr_ShareholderFeesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesTableTextBlock" xlink:label="rr_ShareholderFeesTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesCaption" xlink:label="rr_OperatingExpensesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualFundOperatingExpensesTableTextBlock" xlink:label="rr_AnnualFundOperatingExpensesTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseFootnotesTextBlock" xlink:label="rr_ExpenseFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesDeferredChargesTextBlock" xlink:label="rr_ExpensesDeferredChargesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRangeOfExchangeFeesTextBlock" xlink:label="rr_ExpensesRangeOfExchangeFeesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleHeading" xlink:label="rr_ExpenseExampleHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearHeading" xlink:label="rr_ExpenseExampleByYearHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNarrativeTextBlock" xlink:label="rr_ExpenseExampleNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearCaption" xlink:label="rr_ExpenseExampleByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleWithRedemptionTableTextBlock" xlink:label="rr_ExpenseExampleWithRedemptionTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionNarrativeTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearCaption" xlink:label="rr_ExpenseExampleNoRedemptionByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionTableTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleFootnotesTextBlock" xlink:label="rr_ExpenseExampleFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleClosingTextBlock" xlink:label="rr_ExpenseExampleClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverHeading" xlink:label="rr_PortfolioTurnoverHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverTextBlock" xlink:label="rr_PortfolioTurnoverTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyHeading" xlink:label="rr_StrategyHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyNarrativeTextBlock" xlink:label="rr_StrategyNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskHeading" xlink:label="rr_RiskHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNarrativeTextBlock" xlink:label="rr_RiskNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskFootnotesTextBlock" xlink:label="rr_RiskFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskClosingTextBlock" xlink:label="rr_RiskClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartAndPerformanceTableHeading" xlink:label="rr_BarChartAndPerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceNarrativeTextBlock" xlink:label="rr_PerformanceNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartNarrativeTextBlock" xlink:label="rr_BarChartNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHeading" xlink:label="rr_BarChartHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableTextBlock" xlink:label="rr_BarChartTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartFootnotesTextBlock" xlink:label="rr_BarChartFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartClosingTextBlock" xlink:label="rr_BarChartClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableHeading" xlink:label="rr_PerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableTextBlock" xlink:label="rr_PerformanceTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNarrativeTextBlock" xlink:label="rr_PerformanceTableNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MarketIndexPerformanceTableTextBlock" xlink:label="rr_MarketIndexPerformanceTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesTextBlock" xlink:label="rr_PerformanceTableFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableClosingTextBlock" xlink:label="rr_PerformanceTableClosingTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnHeading" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveHeading" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectivePrimaryTextBlock" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveSecondaryTextBlock" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseHeading" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseNarrativeTextBlock" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesCaption" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesTableTextBlock" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesCaption" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualFundOperatingExpensesTableTextBlock" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseFootnotesTextBlock" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesDeferredChargesTextBlock" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRangeOfExchangeFeesTextBlock" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleHeading" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearHeading" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNarrativeTextBlock" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearCaption" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleWithRedemptionTableTextBlock" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionByYearCaption" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionTableTextBlock" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleFootnotesTextBlock" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleClosingTextBlock" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverHeading" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverTextBlock" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyHeading" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyNarrativeTextBlock" order="27" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskHeading" order="28" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNarrativeTextBlock" order="29" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskFootnotesTextBlock" order="30" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskClosingTextBlock" order="31" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartAndPerformanceTableHeading" order="32" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceNarrativeTextBlock" order="33" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartNarrativeTextBlock" order="34" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHeading" order="35" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartTableTextBlock" order="36" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartFootnotesTextBlock" order="37" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartClosingTextBlock" order="38" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableHeading" order="39" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableTextBlock" order="40" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNarrativeTextBlock" order="41" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MarketIndexPerformanceTableTextBlock" order="42" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesTextBlock" order="43" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableClosingTextBlock" order="44" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledSMALL-CAPPROFUND" xlink:title="000031 - Document - Risk/Return Summary {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003069Member" xlink:label="pf4_S000003069Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003069Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012251Member" xlink:label="pf4_C000012251Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008354Member" xlink:label="pf4_C000008354Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008355Member" xlink:label="pf4_C000008355Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012251Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008354Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008355Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesAbstract" xlink:label="rr_ShareholderFeesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:ShareholderFeesAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesAbstract" xlink:label="rr_ShareholderFeesAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesColumnName" xlink:label="rr_ShareholderFeesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOfferingPrice" xlink:label="rr_MaximumCumulativeSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOther" xlink:label="rr_MaximumCumulativeSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" xlink:label="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOfferingPrice" xlink:label="rr_MaximumDeferredSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOther" xlink:label="rr_MaximumDeferredSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" xlink:label="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFeeOverRedemption" xlink:label="rr_RedemptionFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFee" xlink:label="rr_RedemptionFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFeeOverRedemption" xlink:label="rr_ExchangeFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFee" xlink:label="rr_ExchangeFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFeeOverAssets" xlink:label="rr_MaximumAccountFeeOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFee" xlink:label="rr_MaximumAccountFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeeOther" xlink:label="rr_ShareholderFeeOther" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ShareholderFeesColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOfferingPrice" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOther" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOfferingPrice" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOther" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_RedemptionFeeOverRedemption" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_RedemptionFee" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ExchangeFeeOverRedemption" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ExchangeFee" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumAccountFeeOverAssets" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumAccountFee" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ShareholderFeeOther" order="14" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesSMALL-CAPPROFUND" xlink:title="000032 - Schedule - Shareholder Fees {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003069Member" xlink:label="pf4_S000003069Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003069Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012251Member" xlink:label="pf4_C000012251Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008354Member" xlink:label="pf4_C000008354Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008355Member" xlink:label="pf4_C000008355Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012251Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008354Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008355Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesAbstract" xlink:label="rr_OperatingExpensesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:OperatingExpensesAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesAbstract" xlink:label="rr_OperatingExpensesAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesColumnName" xlink:label="rr_OperatingExpensesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ManagementFeesOverAssets" xlink:label="rr_ManagementFeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionAndService12b1FeesOverAssets" xlink:label="rr_DistributionAndService12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionOrSimilarNon12b1FeesOverAssets" xlink:label="rr_DistributionOrSimilarNon12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component1OtherExpensesOverAssets" xlink:label="rr_Component1OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component2OtherExpensesOverAssets" xlink:label="rr_Component2OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component3OtherExpensesOverAssets" xlink:label="rr_Component3OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesOverAssets" xlink:label="rr_OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AcquiredFundFeesAndExpensesOverAssets" xlink:label="rr_AcquiredFundFeesAndExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOverAssets" xlink:label="rr_ExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssets" xlink:label="rr_FeeWaiverOrReimbursementOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_NetExpensesOverAssets" xlink:label="rr_NetExpensesOverAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_OperatingExpensesColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ManagementFeesOverAssets" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_DistributionAndService12b1FeesOverAssets" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_DistributionOrSimilarNon12b1FeesOverAssets" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_Component1OtherExpensesOverAssets" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_Component2OtherExpensesOverAssets" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_Component3OtherExpensesOverAssets" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_OtherExpensesOverAssets" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_AcquiredFundFeesAndExpensesOverAssets" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ExpensesOverAssets" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssets" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_NetExpensesOverAssets" order="12" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesSMALL-CAPPROFUND" xlink:title="000033 - Schedule - Annual Fund Operating Expenses {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003069Member" xlink:label="pf4_S000003069Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003069Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012251Member" xlink:label="pf4_C000012251Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008354Member" xlink:label="pf4_C000008354Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008355Member" xlink:label="pf4_C000008355Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012251Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008354Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008355Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleAbstract" xlink:label="rr_ExpenseExampleAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:ExpenseExampleAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleAbstract" xlink:label="rr_ExpenseExampleAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearColumnName" xlink:label="rr_ExpenseExampleByYearColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear01" xlink:label="rr_ExpenseExampleYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear03" xlink:label="rr_ExpenseExampleYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear05" xlink:label="rr_ExpenseExampleYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear10" xlink:label="rr_ExpenseExampleYear10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleByYearColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear01" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear03" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear05" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear10" order="5" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedSMALL-CAPPROFUND" xlink:title="000034 - Schedule - Expense Example {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003069Member" xlink:label="pf4_S000003069Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003069Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012251Member" xlink:label="pf4_C000012251Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008354Member" xlink:label="pf4_C000008354Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008355Member" xlink:label="pf4_C000008355Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012251Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008354Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008355Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionAbstract" xlink:label="rr_ExpenseExampleNoRedemptionAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:ExpenseExampleNoRedemptionAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionAbstract" xlink:label="rr_ExpenseExampleNoRedemptionAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearColumnName" xlink:label="rr_ExpenseExampleNoRedemptionByYearColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear01" xlink:label="rr_ExpenseExampleNoRedemptionYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear03" xlink:label="rr_ExpenseExampleNoRedemptionYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear05" xlink:label="rr_ExpenseExampleNoRedemptionYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear10" xlink:label="rr_ExpenseExampleNoRedemptionYear10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionByYearColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear01" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear03" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear05" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear10" order="5" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedSMALL-CAPPROFUND" xlink:title="000035 - Schedule - Expense Example, No Redemption {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003069Member" xlink:label="pf4_S000003069Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003069Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012251Member" xlink:label="pf4_C000012251Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008354Member" xlink:label="pf4_C000008354Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008355Member" xlink:label="pf4_C000008355Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012251Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008354Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008355Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableAbstract" xlink:label="rr_BarChartTableAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:BarChartTableAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableAbstract" xlink:label="rr_BarChartTableAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnCaption" xlink:label="rr_AnnualReturnCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnColumnName" xlink:label="rr_AnnualReturnColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnInceptionDate" xlink:label="rr_AnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1990" xlink:label="rr_AnnualReturn1990" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1991" xlink:label="rr_AnnualReturn1991" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1992" xlink:label="rr_AnnualReturn1992" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1993" xlink:label="rr_AnnualReturn1993" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1994" xlink:label="rr_AnnualReturn1994" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1995" xlink:label="rr_AnnualReturn1995" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1996" xlink:label="rr_AnnualReturn1996" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1997" xlink:label="rr_AnnualReturn1997" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1998" xlink:label="rr_AnnualReturn1998" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1999" xlink:label="rr_AnnualReturn1999" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2000" xlink:label="rr_AnnualReturn2000" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2001" xlink:label="rr_AnnualReturn2001" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2002" xlink:label="rr_AnnualReturn2002" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2003" xlink:label="rr_AnnualReturn2003" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2004" xlink:label="rr_AnnualReturn2004" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2005" xlink:label="rr_AnnualReturn2005" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2006" xlink:label="rr_AnnualReturn2006" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2007" xlink:label="rr_AnnualReturn2007" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2008" xlink:label="rr_AnnualReturn2008" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2009" xlink:label="rr_AnnualReturn2009" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2010" xlink:label="rr_AnnualReturn2010" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2011" xlink:label="rr_AnnualReturn2011" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2012" xlink:label="rr_AnnualReturn2012" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2013" xlink:label="rr_AnnualReturn2013" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2014" xlink:label="rr_AnnualReturn2014" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2015" xlink:label="rr_AnnualReturn2015" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2016" xlink:label="rr_AnnualReturn2016" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2017" xlink:label="rr_AnnualReturn2017" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2018" xlink:label="rr_AnnualReturn2018" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2019" xlink:label="rr_AnnualReturn2019" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2020" xlink:label="rr_AnnualReturn2020" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturnCaption" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturnColumnName" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturnInceptionDate" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1990" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1991" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1992" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1993" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1994" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1995" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1996" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1997" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1998" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1999" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2000" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2001" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2002" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2003" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2004" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2005" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2006" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2007" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2008" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2009" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2010" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2011" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2012" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2013" order="27" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2014" order="28" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2015" order="29" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2016" order="30" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2017" order="31" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2018" order="32" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2019" order="33" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2020" order="34" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsSMALL-CAPPROFUNDBarChart" xlink:title="000036 - Schedule - Annual Total Returns - SMALL-CAP PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003069Member" xlink:label="pf4_S000003069Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003069Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012251Member" xlink:label="pf4_C000012251Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008354Member" xlink:label="pf4_C000008354Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008355Member" xlink:label="pf4_C000008355Member" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012251Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008354Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008355Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_RussellTwentyHundredIndexMember" xlink:label="pf4_RussellTwentyHundredIndexMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="pf4_RussellTwentyHundredIndexMember" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnAbstract" xlink:label="rr_AverageAnnualReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:AverageAnnualReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnAbstract" xlink:label="rr_AverageAnnualReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnLabel" xlink:label="rr_AverageAnnualReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear01" xlink:label="rr_AverageAnnualReturnYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear05" xlink:label="rr_AverageAnnualReturnYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear10" xlink:label="rr_AverageAnnualReturnYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnSinceInception" xlink:label="rr_AverageAnnualReturnSinceInception" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnInceptionDate" xlink:label="rr_AverageAnnualReturnInceptionDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnLabel" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear01" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear05" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear10" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnSinceInception" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnInceptionDate" order="6" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedSMALL-CAPPROFUND" xlink:title="000037 - Schedule - Average Annual Total Returns {Transposed} {- SMALL-CAP PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003069Member" xlink:label="pf4_S000003069Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003069Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012251Member" xlink:label="pf4_C000012251Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008354Member" xlink:label="pf4_C000008354Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008355Member" xlink:label="pf4_C000008355Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012251Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008354Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008355Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnDetailTableTextBlock" xlink:label="rr_RiskReturnDetailTableTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnDetailTableTextBlock" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledSMALL-CAPPROFUND" xlink:title="000038 - Document - Risk/Return Detail {Unlabeled} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003069Member" xlink:label="pf4_S000003069Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003069Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_RussellTwentyHundredIndexMember" xlink:label="pf4_RussellTwentyHundredIndexMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="pf4_RussellTwentyHundredIndexMember" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012251Member" xlink:label="pf4_C000012251Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008354Member" xlink:label="pf4_C000008354Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008355Member" xlink:label="pf4_C000008355Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012251Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008354Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008355Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusDate" xlink:label="rr_ProspectusDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnHeading" xlink:label="rr_RiskReturnHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveHeading" xlink:label="rr_ObjectiveHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectivePrimaryTextBlock" xlink:label="rr_ObjectivePrimaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveSecondaryTextBlock" xlink:label="rr_ObjectiveSecondaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseHeading" xlink:label="rr_ExpenseHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseNarrativeTextBlock" xlink:label="rr_ExpenseNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesCaption" xlink:label="rr_ShareholderFeesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesColumnName" xlink:label="rr_ShareholderFeesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOfferingPrice" xlink:label="rr_MaximumCumulativeSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOther" xlink:label="rr_MaximumCumulativeSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" xlink:label="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOfferingPrice" xlink:label="rr_MaximumDeferredSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOther" xlink:label="rr_MaximumDeferredSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" xlink:label="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFeeOverRedemption" xlink:label="rr_RedemptionFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFee" xlink:label="rr_RedemptionFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFeeOverRedemption" xlink:label="rr_ExchangeFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFee" xlink:label="rr_ExchangeFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFeeOverAssets" xlink:label="rr_MaximumAccountFeeOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFee" xlink:label="rr_MaximumAccountFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeeOther" xlink:label="rr_ShareholderFeeOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesCaption" xlink:label="rr_OperatingExpensesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesColumnName" xlink:label="rr_OperatingExpensesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ManagementFeesOverAssets" xlink:label="rr_ManagementFeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionAndService12b1FeesOverAssets" xlink:label="rr_DistributionAndService12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionOrSimilarNon12b1FeesOverAssets" xlink:label="rr_DistributionOrSimilarNon12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component1OtherExpensesOverAssets" xlink:label="rr_Component1OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component2OtherExpensesOverAssets" xlink:label="rr_Component2OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component3OtherExpensesOverAssets" xlink:label="rr_Component3OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesOverAssets" xlink:label="rr_OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AcquiredFundFeesAndExpensesOverAssets" xlink:label="rr_AcquiredFundFeesAndExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOverAssets" xlink:label="rr_ExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssets" xlink:label="rr_FeeWaiverOrReimbursementOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_NetExpensesOverAssets" xlink:label="rr_NetExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" xlink:label="rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverHeading" xlink:label="rr_PortfolioTurnoverHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverTextBlock" xlink:label="rr_PortfolioTurnoverTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverRate" xlink:label="rr_PortfolioTurnoverRate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseFootnotesTextBlock" xlink:label="rr_ExpenseFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesDeferredChargesTextBlock" xlink:label="rr_ExpensesDeferredChargesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRangeOfExchangeFeesTextBlock" xlink:label="rr_ExpensesRangeOfExchangeFeesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseBreakpointDiscounts" xlink:label="rr_ExpenseBreakpointDiscounts" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseBreakpointMinimumInvestmentRequiredAmount" xlink:label="rr_ExpenseBreakpointMinimumInvestmentRequiredAmount" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExchangeTradedFundCommissions" xlink:label="rr_ExpenseExchangeTradedFundCommissions" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRepresentBothMasterAndFeeder" xlink:label="rr_ExpensesRepresentBothMasterAndFeeder" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesExplanationOfNonrecurringAccountFee" xlink:label="rr_ExpensesExplanationOfNonrecurringAccountFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesNewFundBasedOnEstimates" xlink:label="rr_OtherExpensesNewFundBasedOnEstimates" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AcquiredFundFeesAndExpensesBasedOnEstimates" xlink:label="rr_AcquiredFundFeesAndExpensesBasedOnEstimates" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded" xlink:label="rr_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRestatedToReflectCurrent" xlink:label="rr_ExpensesRestatedToReflectCurrent" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees" xlink:label="rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleHeading" xlink:label="rr_ExpenseExampleHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearHeading" xlink:label="rr_ExpenseExampleByYearHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNarrativeTextBlock" xlink:label="rr_ExpenseExampleNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearCaption" xlink:label="rr_ExpenseExampleByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear01" xlink:label="rr_ExpenseExampleYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear03" xlink:label="rr_ExpenseExampleYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear05" xlink:label="rr_ExpenseExampleYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear10" xlink:label="rr_ExpenseExampleYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionNarrativeTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearCaption" xlink:label="rr_ExpenseExampleNoRedemptionByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear01" xlink:label="rr_ExpenseExampleNoRedemptionYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear03" xlink:label="rr_ExpenseExampleNoRedemptionYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear05" xlink:label="rr_ExpenseExampleNoRedemptionYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear10" xlink:label="rr_ExpenseExampleNoRedemptionYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleFootnotesTextBlock" xlink:label="rr_ExpenseExampleFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleClosingTextBlock" xlink:label="rr_ExpenseExampleClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyHeading" xlink:label="rr_StrategyHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyNarrativeTextBlock" xlink:label="rr_StrategyNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyPortfolioConcentration" xlink:label="rr_StrategyPortfolioConcentration" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskHeading" xlink:label="rr_RiskHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNarrativeTextBlock" xlink:label="rr_RiskNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskFootnotesTextBlock" xlink:label="rr_RiskFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskClosingTextBlock" xlink:label="rr_RiskClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskLoseMoney" xlink:label="rr_RiskLoseMoney" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNondiversifiedStatus" xlink:label="rr_RiskNondiversifiedStatus" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskMoneyMarketFund" xlink:label="rr_RiskMoneyMarketFund" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNotInsuredDepositoryInstitution" xlink:label="rr_RiskNotInsuredDepositoryInstitution" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskCaption" xlink:label="rr_RiskCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskColumnName" xlink:label="rr_RiskColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Risk" xlink:label="rr_Risk" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartAndPerformanceTableHeading" xlink:label="rr_BarChartAndPerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceNarrativeTextBlock" xlink:label="rr_PerformanceNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceInformationIllustratesVariabilityOfReturns" xlink:label="rr_PerformanceInformationIllustratesVariabilityOfReturns" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceOneYearOrLess" xlink:label="rr_PerformanceOneYearOrLess" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAdditionalMarketIndex" xlink:label="rr_PerformanceAdditionalMarketIndex" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAvailabilityPhone" xlink:label="rr_PerformanceAvailabilityPhone" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAvailabilityWebSiteAddress" xlink:label="rr_PerformanceAvailabilityWebSiteAddress" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformancePastDoesNotIndicateFuture" xlink:label="rr_PerformancePastDoesNotIndicateFuture" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHeading" xlink:label="rr_BarChartHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartNarrativeTextBlock" xlink:label="rr_BarChartNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartDoesNotReflectSalesLoads" xlink:label="rr_BarChartDoesNotReflectSalesLoads" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnCaption" xlink:label="rr_AnnualReturnCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnColumnName" xlink:label="rr_AnnualReturnColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnInceptionDate" xlink:label="rr_AnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1990" xlink:label="rr_AnnualReturn1990" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1991" xlink:label="rr_AnnualReturn1991" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1992" xlink:label="rr_AnnualReturn1992" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1993" xlink:label="rr_AnnualReturn1993" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1994" xlink:label="rr_AnnualReturn1994" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1995" xlink:label="rr_AnnualReturn1995" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1996" xlink:label="rr_AnnualReturn1996" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1997" xlink:label="rr_AnnualReturn1997" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1998" xlink:label="rr_AnnualReturn1998" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1999" xlink:label="rr_AnnualReturn1999" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2000" xlink:label="rr_AnnualReturn2000" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2001" xlink:label="rr_AnnualReturn2001" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2002" xlink:label="rr_AnnualReturn2002" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2003" xlink:label="rr_AnnualReturn2003" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2004" xlink:label="rr_AnnualReturn2004" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2005" xlink:label="rr_AnnualReturn2005" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2006" xlink:label="rr_AnnualReturn2006" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2007" xlink:label="rr_AnnualReturn2007" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2008" xlink:label="rr_AnnualReturn2008" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2009" xlink:label="rr_AnnualReturn2009" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2010" xlink:label="rr_AnnualReturn2010" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2011" xlink:label="rr_AnnualReturn2011" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2012" xlink:label="rr_AnnualReturn2012" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2013" xlink:label="rr_AnnualReturn2013" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2014" xlink:label="rr_AnnualReturn2014" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2015" xlink:label="rr_AnnualReturn2015" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2016" xlink:label="rr_AnnualReturn2016" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2017" xlink:label="rr_AnnualReturn2017" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2018" xlink:label="rr_AnnualReturn2018" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2019" xlink:label="rr_AnnualReturn2019" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2020" xlink:label="rr_AnnualReturn2020" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartFootnotesTextBlock" xlink:label="rr_BarChartFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartClosingTextBlock" xlink:label="rr_BarChartClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod" xlink:label="rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartReturnsForClassNotOfferedInProspectus" xlink:label="rr_BarChartReturnsForClassNotOfferedInProspectus" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_YearToDateReturnLabel" xlink:label="rr_YearToDateReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartYearToDateReturnDate" xlink:label="rr_BarChartYearToDateReturnDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartYearToDateReturn" xlink:label="rr_BarChartYearToDateReturn" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_HighestQuarterlyReturnLabel" xlink:label="rr_HighestQuarterlyReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHighestQuarterlyReturnDate" xlink:label="rr_BarChartHighestQuarterlyReturnDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHighestQuarterlyReturn" xlink:label="rr_BarChartHighestQuarterlyReturn" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_LowestQuarterlyReturnLabel" xlink:label="rr_LowestQuarterlyReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartLowestQuarterlyReturnDate" xlink:label="rr_BarChartLowestQuarterlyReturnDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartLowestQuarterlyReturn" xlink:label="rr_BarChartLowestQuarterlyReturn" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableHeading" xlink:label="rr_PerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableDoesReflectSalesLoads" xlink:label="rr_PerformanceTableDoesReflectSalesLoads" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableMarketIndexChanged" xlink:label="rr_PerformanceTableMarketIndexChanged" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_IndexNoDeductionForFeesExpensesTaxes" xlink:label="rr_IndexNoDeductionForFeesExpensesTaxes" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableUsesHighestFederalRate" xlink:label="rr_PerformanceTableUsesHighestFederalRate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNotRelevantToTaxDeferred" xlink:label="rr_PerformanceTableNotRelevantToTaxDeferred" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableOneClassOfAfterTaxShown" xlink:label="rr_PerformanceTableOneClassOfAfterTaxShown" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableExplanationAfterTaxHigher" xlink:label="rr_PerformanceTableExplanationAfterTaxHigher" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNarrativeTextBlock" xlink:label="rr_PerformanceTableNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod" xlink:label="rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesTextBlock" xlink:label="rr_PerformanceTableFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableClosingTextBlock" xlink:label="rr_PerformanceTableClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnCaption" xlink:label="rr_AverageAnnualReturnCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnColumnName" xlink:label="rr_AverageAnnualReturnColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnLabel" xlink:label="rr_AverageAnnualReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear01" xlink:label="rr_AverageAnnualReturnYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear05" xlink:label="rr_AverageAnnualReturnYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear10" xlink:label="rr_AverageAnnualReturnYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnSinceInception" xlink:label="rr_AverageAnnualReturnSinceInception" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnInceptionDate" xlink:label="rr_AverageAnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYieldCaption" xlink:label="rr_MoneyMarketSevenDayYieldCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYieldColumnName" xlink:label="rr_MoneyMarketSevenDayYieldColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYieldPhone" xlink:label="rr_MoneyMarketSevenDayYieldPhone" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYield" xlink:label="rr_MoneyMarketSevenDayYield" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayTaxEquivalentYield" xlink:label="rr_MoneyMarketSevenDayTaxEquivalentYield" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYieldCaption" xlink:label="rr_ThirtyDayYieldCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYieldColumnName" xlink:label="rr_ThirtyDayYieldColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYieldPhone" xlink:label="rr_ThirtyDayYieldPhone" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYield" xlink:label="rr_ThirtyDayYield" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayTaxEquivalentYield" xlink:label="rr_ThirtyDayTaxEquivalentYield" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_EntityRegistrantName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusDate" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnHeading" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveHeading" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectivePrimaryTextBlock" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveSecondaryTextBlock" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseHeading" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseNarrativeTextBlock" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesCaption" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesColumnName" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOfferingPrice" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOther" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOfferingPrice" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOther" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RedemptionFeeOverRedemption" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RedemptionFee" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExchangeFeeOverRedemption" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExchangeFee" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumAccountFeeOverAssets" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumAccountFee" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeeOther" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesCaption" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesColumnName" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ManagementFeesOverAssets" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_DistributionAndService12b1FeesOverAssets" order="27" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_DistributionOrSimilarNon12b1FeesOverAssets" order="28" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Component1OtherExpensesOverAssets" order="29" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Component2OtherExpensesOverAssets" order="30" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Component3OtherExpensesOverAssets" order="31" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OtherExpensesOverAssets" order="32" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AcquiredFundFeesAndExpensesOverAssets" order="33" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesOverAssets" order="34" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssets" order="35" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_NetExpensesOverAssets" order="36" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" order="37" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverHeading" order="38" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverTextBlock" order="39" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverRate" order="40" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseFootnotesTextBlock" order="41" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesDeferredChargesTextBlock" order="42" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRangeOfExchangeFeesTextBlock" order="43" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseBreakpointDiscounts" order="44" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseBreakpointMinimumInvestmentRequiredAmount" order="45" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExchangeTradedFundCommissions" order="46" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRepresentBothMasterAndFeeder" order="47" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesExplanationOfNonrecurringAccountFee" order="48" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OtherExpensesNewFundBasedOnEstimates" order="49" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AcquiredFundFeesAndExpensesBasedOnEstimates" order="50" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded" order="51" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRestatedToReflectCurrent" order="52" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees" order="53" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleHeading" order="54" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearHeading" order="55" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNarrativeTextBlock" order="56" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearCaption" order="57" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear01" order="58" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear03" order="59" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear05" order="60" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear10" order="61" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" order="62" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionByYearCaption" order="63" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear01" order="64" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear03" order="65" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear05" order="66" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear10" order="67" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleFootnotesTextBlock" order="68" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleClosingTextBlock" order="69" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyHeading" order="70" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyNarrativeTextBlock" order="71" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyPortfolioConcentration" order="72" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskHeading" order="73" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNarrativeTextBlock" order="74" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskFootnotesTextBlock" order="75" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskClosingTextBlock" order="76" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskLoseMoney" order="77" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNondiversifiedStatus" order="78" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskMoneyMarketFund" order="79" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNotInsuredDepositoryInstitution" order="80" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskCaption" order="81" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskColumnName" order="82" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Risk" order="83" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartAndPerformanceTableHeading" order="84" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceNarrativeTextBlock" order="85" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceInformationIllustratesVariabilityOfReturns" order="86" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceOneYearOrLess" order="87" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAdditionalMarketIndex" order="88" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAvailabilityPhone" order="89" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAvailabilityWebSiteAddress" order="90" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformancePastDoesNotIndicateFuture" order="91" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHeading" order="92" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartNarrativeTextBlock" order="93" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartDoesNotReflectSalesLoads" order="94" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturnCaption" order="95" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturnColumnName" order="96" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturnInceptionDate" order="97" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1990" order="98" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1991" order="99" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1992" order="100" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1993" order="101" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1994" order="102" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1995" order="103" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1996" order="104" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1997" order="105" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1998" order="106" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1999" order="107" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2000" order="108" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2001" order="109" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2002" order="110" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2003" order="111" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2004" order="112" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2005" order="113" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2006" order="114" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2007" order="115" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2008" order="116" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2009" order="117" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2010" order="118" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2011" order="119" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2012" order="120" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2013" order="121" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2014" order="122" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2015" order="123" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2016" order="124" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2017" order="125" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2018" order="126" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2019" order="127" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2020" order="128" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartFootnotesTextBlock" order="129" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartClosingTextBlock" order="130" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod" order="131" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartReturnsForClassNotOfferedInProspectus" order="132" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_YearToDateReturnLabel" order="133" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartYearToDateReturnDate" order="134" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartYearToDateReturn" order="135" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_HighestQuarterlyReturnLabel" order="136" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHighestQuarterlyReturnDate" order="137" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHighestQuarterlyReturn" order="138" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_LowestQuarterlyReturnLabel" order="139" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartLowestQuarterlyReturnDate" order="140" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartLowestQuarterlyReturn" order="141" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableHeading" order="142" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableDoesReflectSalesLoads" order="143" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableMarketIndexChanged" order="144" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_IndexNoDeductionForFeesExpensesTaxes" order="145" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableUsesHighestFederalRate" order="146" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNotRelevantToTaxDeferred" order="147" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableOneClassOfAfterTaxShown" order="148" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableExplanationAfterTaxHigher" order="149" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNarrativeTextBlock" order="150" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod" order="151" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesTextBlock" order="152" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableClosingTextBlock" order="153" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnCaption" order="154" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnColumnName" order="155" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnLabel" order="156" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear01" order="157" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear05" order="158" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear10" order="159" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnSinceInception" order="160" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnInceptionDate" order="161" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYieldCaption" order="162" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYieldColumnName" order="163" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYieldPhone" order="164" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYield" order="165" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayTaxEquivalentYield" order="166" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYieldCaption" order="167" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYieldColumnName" order="168" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYieldPhone" order="169" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYield" order="170" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayTaxEquivalentYield" order="171" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsSMALL-CAPPROFUND" xlink:title="000039 - Disclosure - Risk/Return Detail Data {Elements} - SMALL-CAP PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003070Member" xlink:label="pf4_S000003070Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003070Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012252Member" xlink:label="pf4_C000012252Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008356Member" xlink:label="pf4_C000008356Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008357Member" xlink:label="pf4_C000008357Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012252Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008356Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008357Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnHeading" xlink:label="rr_RiskReturnHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveHeading" xlink:label="rr_ObjectiveHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectivePrimaryTextBlock" xlink:label="rr_ObjectivePrimaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveSecondaryTextBlock" xlink:label="rr_ObjectiveSecondaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseHeading" xlink:label="rr_ExpenseHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseNarrativeTextBlock" xlink:label="rr_ExpenseNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesCaption" xlink:label="rr_ShareholderFeesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesTableTextBlock" xlink:label="rr_ShareholderFeesTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesCaption" xlink:label="rr_OperatingExpensesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualFundOperatingExpensesTableTextBlock" xlink:label="rr_AnnualFundOperatingExpensesTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseFootnotesTextBlock" xlink:label="rr_ExpenseFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesDeferredChargesTextBlock" xlink:label="rr_ExpensesDeferredChargesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRangeOfExchangeFeesTextBlock" xlink:label="rr_ExpensesRangeOfExchangeFeesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleHeading" xlink:label="rr_ExpenseExampleHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearHeading" xlink:label="rr_ExpenseExampleByYearHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNarrativeTextBlock" xlink:label="rr_ExpenseExampleNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearCaption" xlink:label="rr_ExpenseExampleByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleWithRedemptionTableTextBlock" xlink:label="rr_ExpenseExampleWithRedemptionTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionNarrativeTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearCaption" xlink:label="rr_ExpenseExampleNoRedemptionByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionTableTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleFootnotesTextBlock" xlink:label="rr_ExpenseExampleFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleClosingTextBlock" xlink:label="rr_ExpenseExampleClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverHeading" xlink:label="rr_PortfolioTurnoverHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverTextBlock" xlink:label="rr_PortfolioTurnoverTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyHeading" xlink:label="rr_StrategyHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyNarrativeTextBlock" xlink:label="rr_StrategyNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskHeading" xlink:label="rr_RiskHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNarrativeTextBlock" xlink:label="rr_RiskNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskFootnotesTextBlock" xlink:label="rr_RiskFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskClosingTextBlock" xlink:label="rr_RiskClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartAndPerformanceTableHeading" xlink:label="rr_BarChartAndPerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceNarrativeTextBlock" xlink:label="rr_PerformanceNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartNarrativeTextBlock" xlink:label="rr_BarChartNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHeading" xlink:label="rr_BarChartHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableTextBlock" xlink:label="rr_BarChartTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartFootnotesTextBlock" xlink:label="rr_BarChartFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartClosingTextBlock" xlink:label="rr_BarChartClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableHeading" xlink:label="rr_PerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableTextBlock" xlink:label="rr_PerformanceTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNarrativeTextBlock" xlink:label="rr_PerformanceTableNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MarketIndexPerformanceTableTextBlock" xlink:label="rr_MarketIndexPerformanceTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesTextBlock" xlink:label="rr_PerformanceTableFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableClosingTextBlock" xlink:label="rr_PerformanceTableClosingTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnHeading" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveHeading" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectivePrimaryTextBlock" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveSecondaryTextBlock" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseHeading" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseNarrativeTextBlock" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesCaption" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesTableTextBlock" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesCaption" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualFundOperatingExpensesTableTextBlock" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseFootnotesTextBlock" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesDeferredChargesTextBlock" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRangeOfExchangeFeesTextBlock" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleHeading" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearHeading" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNarrativeTextBlock" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearCaption" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleWithRedemptionTableTextBlock" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionByYearCaption" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionTableTextBlock" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleFootnotesTextBlock" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleClosingTextBlock" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverHeading" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverTextBlock" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyHeading" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyNarrativeTextBlock" order="27" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskHeading" order="28" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNarrativeTextBlock" order="29" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskFootnotesTextBlock" order="30" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskClosingTextBlock" order="31" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartAndPerformanceTableHeading" order="32" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceNarrativeTextBlock" order="33" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartNarrativeTextBlock" order="34" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHeading" order="35" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartTableTextBlock" order="36" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartFootnotesTextBlock" order="37" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartClosingTextBlock" order="38" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableHeading" order="39" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableTextBlock" order="40" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNarrativeTextBlock" order="41" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MarketIndexPerformanceTableTextBlock" order="42" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesTextBlock" order="43" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableClosingTextBlock" order="44" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledNASDAQ-100PROFUND" xlink:title="000041 - Document - Risk/Return Summary {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003070Member" xlink:label="pf4_S000003070Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003070Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012252Member" xlink:label="pf4_C000012252Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008356Member" xlink:label="pf4_C000008356Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008357Member" xlink:label="pf4_C000008357Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012252Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008356Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008357Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesAbstract" xlink:label="rr_ShareholderFeesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:ShareholderFeesAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesAbstract" xlink:label="rr_ShareholderFeesAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesColumnName" xlink:label="rr_ShareholderFeesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOfferingPrice" xlink:label="rr_MaximumCumulativeSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOther" xlink:label="rr_MaximumCumulativeSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" xlink:label="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOfferingPrice" xlink:label="rr_MaximumDeferredSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOther" xlink:label="rr_MaximumDeferredSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" xlink:label="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFeeOverRedemption" xlink:label="rr_RedemptionFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFee" xlink:label="rr_RedemptionFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFeeOverRedemption" xlink:label="rr_ExchangeFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFee" xlink:label="rr_ExchangeFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFeeOverAssets" xlink:label="rr_MaximumAccountFeeOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFee" xlink:label="rr_MaximumAccountFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeeOther" xlink:label="rr_ShareholderFeeOther" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ShareholderFeesColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOfferingPrice" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOther" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOfferingPrice" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOther" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_RedemptionFeeOverRedemption" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_RedemptionFee" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ExchangeFeeOverRedemption" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ExchangeFee" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumAccountFeeOverAssets" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_MaximumAccountFee" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ShareholderFeeOther" order="14" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleShareholderFeesNASDAQ-100PROFUND" xlink:title="000042 - Schedule - Shareholder Fees {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003070Member" xlink:label="pf4_S000003070Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003070Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012252Member" xlink:label="pf4_C000012252Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008356Member" xlink:label="pf4_C000008356Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008357Member" xlink:label="pf4_C000008357Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012252Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008356Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008357Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesAbstract" xlink:label="rr_OperatingExpensesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:OperatingExpensesAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesAbstract" xlink:label="rr_OperatingExpensesAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesColumnName" xlink:label="rr_OperatingExpensesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ManagementFeesOverAssets" xlink:label="rr_ManagementFeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionAndService12b1FeesOverAssets" xlink:label="rr_DistributionAndService12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionOrSimilarNon12b1FeesOverAssets" xlink:label="rr_DistributionOrSimilarNon12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component1OtherExpensesOverAssets" xlink:label="rr_Component1OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component2OtherExpensesOverAssets" xlink:label="rr_Component2OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component3OtherExpensesOverAssets" xlink:label="rr_Component3OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesOverAssets" xlink:label="rr_OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AcquiredFundFeesAndExpensesOverAssets" xlink:label="rr_AcquiredFundFeesAndExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOverAssets" xlink:label="rr_ExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssets" xlink:label="rr_FeeWaiverOrReimbursementOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_NetExpensesOverAssets" xlink:label="rr_NetExpensesOverAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_OperatingExpensesColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ManagementFeesOverAssets" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_DistributionAndService12b1FeesOverAssets" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_DistributionOrSimilarNon12b1FeesOverAssets" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_Component1OtherExpensesOverAssets" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_Component2OtherExpensesOverAssets" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_Component3OtherExpensesOverAssets" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_OtherExpensesOverAssets" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_AcquiredFundFeesAndExpensesOverAssets" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ExpensesOverAssets" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssets" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_NetExpensesOverAssets" order="12" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualFundOperatingExpensesNASDAQ-100PROFUND" xlink:title="000043 - Schedule - Annual Fund Operating Expenses {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003070Member" xlink:label="pf4_S000003070Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003070Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012252Member" xlink:label="pf4_C000012252Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008356Member" xlink:label="pf4_C000008356Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008357Member" xlink:label="pf4_C000008357Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012252Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008356Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008357Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleAbstract" xlink:label="rr_ExpenseExampleAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:ExpenseExampleAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleAbstract" xlink:label="rr_ExpenseExampleAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearColumnName" xlink:label="rr_ExpenseExampleByYearColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear01" xlink:label="rr_ExpenseExampleYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear03" xlink:label="rr_ExpenseExampleYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear05" xlink:label="rr_ExpenseExampleYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear10" xlink:label="rr_ExpenseExampleYear10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleByYearColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear01" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear03" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear05" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear10" order="5" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleTransposedNASDAQ-100PROFUND" xlink:title="000044 - Schedule - Expense Example {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003070Member" xlink:label="pf4_S000003070Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003070Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012252Member" xlink:label="pf4_C000012252Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008356Member" xlink:label="pf4_C000008356Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008357Member" xlink:label="pf4_C000008357Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012252Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008356Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008357Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionAbstract" xlink:label="rr_ExpenseExampleNoRedemptionAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:ExpenseExampleNoRedemptionAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionAbstract" xlink:label="rr_ExpenseExampleNoRedemptionAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearColumnName" xlink:label="rr_ExpenseExampleNoRedemptionByYearColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear01" xlink:label="rr_ExpenseExampleNoRedemptionYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear03" xlink:label="rr_ExpenseExampleNoRedemptionYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear05" xlink:label="rr_ExpenseExampleNoRedemptionYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear10" xlink:label="rr_ExpenseExampleNoRedemptionYear10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionByYearColumnName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear01" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear03" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear05" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleNoRedemptionAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear10" order="5" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleExpenseExampleNoRedemptionTransposedNASDAQ-100PROFUND" xlink:title="000045 - Schedule - Expense Example, No Redemption {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003070Member" xlink:label="pf4_S000003070Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003070Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012252Member" xlink:label="pf4_C000012252Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008356Member" xlink:label="pf4_C000008356Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008357Member" xlink:label="pf4_C000008357Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012252Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008356Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008357Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableAbstract" xlink:label="rr_BarChartTableAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:BarChartTableAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableAbstract" xlink:label="rr_BarChartTableAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnCaption" xlink:label="rr_AnnualReturnCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnColumnName" xlink:label="rr_AnnualReturnColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnInceptionDate" xlink:label="rr_AnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1990" xlink:label="rr_AnnualReturn1990" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1991" xlink:label="rr_AnnualReturn1991" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1992" xlink:label="rr_AnnualReturn1992" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1993" xlink:label="rr_AnnualReturn1993" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1994" xlink:label="rr_AnnualReturn1994" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1995" xlink:label="rr_AnnualReturn1995" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1996" xlink:label="rr_AnnualReturn1996" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1997" xlink:label="rr_AnnualReturn1997" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1998" xlink:label="rr_AnnualReturn1998" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1999" xlink:label="rr_AnnualReturn1999" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2000" xlink:label="rr_AnnualReturn2000" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2001" xlink:label="rr_AnnualReturn2001" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2002" xlink:label="rr_AnnualReturn2002" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2003" xlink:label="rr_AnnualReturn2003" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2004" xlink:label="rr_AnnualReturn2004" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2005" xlink:label="rr_AnnualReturn2005" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2006" xlink:label="rr_AnnualReturn2006" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2007" xlink:label="rr_AnnualReturn2007" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2008" xlink:label="rr_AnnualReturn2008" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2009" xlink:label="rr_AnnualReturn2009" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2010" xlink:label="rr_AnnualReturn2010" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2011" xlink:label="rr_AnnualReturn2011" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2012" xlink:label="rr_AnnualReturn2012" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2013" xlink:label="rr_AnnualReturn2013" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2014" xlink:label="rr_AnnualReturn2014" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2015" xlink:label="rr_AnnualReturn2015" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2016" xlink:label="rr_AnnualReturn2016" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2017" xlink:label="rr_AnnualReturn2017" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2018" xlink:label="rr_AnnualReturn2018" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2019" xlink:label="rr_AnnualReturn2019" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2020" xlink:label="rr_AnnualReturn2020" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturnCaption" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturnColumnName" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturnInceptionDate" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1990" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1991" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1992" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1993" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1994" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1995" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1996" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1997" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1998" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn1999" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2000" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2001" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2002" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2003" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2004" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2005" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2006" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2007" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2008" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2009" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2010" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2011" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2012" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2013" order="27" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2014" order="28" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2015" order="29" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2016" order="30" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2017" order="31" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2018" order="32" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2019" order="33" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2020" order="34" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAnnualTotalReturnsNASDAQ-100PROFUNDBarChart" xlink:title="000046 - Schedule - Annual Total Returns - NASDAQ-100 PROFUND [BarChart]">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003070Member" xlink:label="pf4_S000003070Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003070Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012252Member" xlink:label="pf4_C000012252Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008356Member" xlink:label="pf4_C000008356Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008357Member" xlink:label="pf4_C000008357Member" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012252Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008356Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008357Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_NasdaqOneHundredIndexMember" xlink:label="pf4_NasdaqOneHundredIndexMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="pf4_NasdaqOneHundredIndexMember" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnAbstract" xlink:label="rr_AverageAnnualReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:AverageAnnualReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnAbstract" xlink:label="rr_AverageAnnualReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnLabel" xlink:label="rr_AverageAnnualReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear01" xlink:label="rr_AverageAnnualReturnYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear05" xlink:label="rr_AverageAnnualReturnYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear10" xlink:label="rr_AverageAnnualReturnYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnSinceInception" xlink:label="rr_AverageAnnualReturnSinceInception" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnInceptionDate" xlink:label="rr_AverageAnnualReturnInceptionDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnLabel" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear01" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear05" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear10" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnSinceInception" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnInceptionDate" order="6" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNASDAQ-100PROFUND" xlink:title="000047 - Schedule - Average Annual Total Returns {Transposed} {- NASDAQ-100 PROFUND}">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003070Member" xlink:label="pf4_S000003070Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003070Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012252Member" xlink:label="pf4_C000012252Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008356Member" xlink:label="pf4_C000008356Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008357Member" xlink:label="pf4_C000008357Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012252Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008356Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008357Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnDetailTableTextBlock" xlink:label="rr_RiskReturnDetailTableTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnDetailTableTextBlock" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnDetailUnlabeledNASDAQ-100PROFUND" xlink:title="000048 - Document - Risk/Return Detail {Unlabeled} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003070Member" xlink:label="pf4_S000003070Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003070Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_NasdaqOneHundredIndexMember" xlink:label="pf4_NasdaqOneHundredIndexMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="pf4_NasdaqOneHundredIndexMember" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012252Member" xlink:label="pf4_C000012252Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008356Member" xlink:label="pf4_C000008356Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008357Member" xlink:label="pf4_C000008357Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012252Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008356Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008357Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusDate" xlink:label="rr_ProspectusDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnHeading" xlink:label="rr_RiskReturnHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveHeading" xlink:label="rr_ObjectiveHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectivePrimaryTextBlock" xlink:label="rr_ObjectivePrimaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveSecondaryTextBlock" xlink:label="rr_ObjectiveSecondaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseHeading" xlink:label="rr_ExpenseHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseNarrativeTextBlock" xlink:label="rr_ExpenseNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesCaption" xlink:label="rr_ShareholderFeesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesColumnName" xlink:label="rr_ShareholderFeesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOfferingPrice" xlink:label="rr_MaximumCumulativeSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumCumulativeSalesChargeOverOther" xlink:label="rr_MaximumCumulativeSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" xlink:label="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOfferingPrice" xlink:label="rr_MaximumDeferredSalesChargeOverOfferingPrice" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumDeferredSalesChargeOverOther" xlink:label="rr_MaximumDeferredSalesChargeOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" xlink:label="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFeeOverRedemption" xlink:label="rr_RedemptionFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFee" xlink:label="rr_RedemptionFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFeeOverRedemption" xlink:label="rr_ExchangeFeeOverRedemption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExchangeFee" xlink:label="rr_ExchangeFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFeeOverAssets" xlink:label="rr_MaximumAccountFeeOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MaximumAccountFee" xlink:label="rr_MaximumAccountFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeeOther" xlink:label="rr_ShareholderFeeOther" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesCaption" xlink:label="rr_OperatingExpensesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesColumnName" xlink:label="rr_OperatingExpensesColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ManagementFeesOverAssets" xlink:label="rr_ManagementFeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionAndService12b1FeesOverAssets" xlink:label="rr_DistributionAndService12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionOrSimilarNon12b1FeesOverAssets" xlink:label="rr_DistributionOrSimilarNon12b1FeesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component1OtherExpensesOverAssets" xlink:label="rr_Component1OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component2OtherExpensesOverAssets" xlink:label="rr_Component2OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Component3OtherExpensesOverAssets" xlink:label="rr_Component3OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesOverAssets" xlink:label="rr_OtherExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AcquiredFundFeesAndExpensesOverAssets" xlink:label="rr_AcquiredFundFeesAndExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOverAssets" xlink:label="rr_ExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssets" xlink:label="rr_FeeWaiverOrReimbursementOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_NetExpensesOverAssets" xlink:label="rr_NetExpensesOverAssets" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" xlink:label="rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverHeading" xlink:label="rr_PortfolioTurnoverHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverTextBlock" xlink:label="rr_PortfolioTurnoverTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverRate" xlink:label="rr_PortfolioTurnoverRate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseFootnotesTextBlock" xlink:label="rr_ExpenseFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesDeferredChargesTextBlock" xlink:label="rr_ExpensesDeferredChargesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRangeOfExchangeFeesTextBlock" xlink:label="rr_ExpensesRangeOfExchangeFeesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseBreakpointDiscounts" xlink:label="rr_ExpenseBreakpointDiscounts" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseBreakpointMinimumInvestmentRequiredAmount" xlink:label="rr_ExpenseBreakpointMinimumInvestmentRequiredAmount" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExchangeTradedFundCommissions" xlink:label="rr_ExpenseExchangeTradedFundCommissions" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRepresentBothMasterAndFeeder" xlink:label="rr_ExpensesRepresentBothMasterAndFeeder" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesExplanationOfNonrecurringAccountFee" xlink:label="rr_ExpensesExplanationOfNonrecurringAccountFee" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesNewFundBasedOnEstimates" xlink:label="rr_OtherExpensesNewFundBasedOnEstimates" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AcquiredFundFeesAndExpensesBasedOnEstimates" xlink:label="rr_AcquiredFundFeesAndExpensesBasedOnEstimates" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded" xlink:label="rr_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRestatedToReflectCurrent" xlink:label="rr_ExpensesRestatedToReflectCurrent" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees" xlink:label="rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleHeading" xlink:label="rr_ExpenseExampleHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearHeading" xlink:label="rr_ExpenseExampleByYearHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNarrativeTextBlock" xlink:label="rr_ExpenseExampleNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearCaption" xlink:label="rr_ExpenseExampleByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear01" xlink:label="rr_ExpenseExampleYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear03" xlink:label="rr_ExpenseExampleYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear05" xlink:label="rr_ExpenseExampleYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear10" xlink:label="rr_ExpenseExampleYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionNarrativeTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearCaption" xlink:label="rr_ExpenseExampleNoRedemptionByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear01" xlink:label="rr_ExpenseExampleNoRedemptionYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear03" xlink:label="rr_ExpenseExampleNoRedemptionYear03" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear05" xlink:label="rr_ExpenseExampleNoRedemptionYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionYear10" xlink:label="rr_ExpenseExampleNoRedemptionYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleFootnotesTextBlock" xlink:label="rr_ExpenseExampleFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleClosingTextBlock" xlink:label="rr_ExpenseExampleClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyHeading" xlink:label="rr_StrategyHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyNarrativeTextBlock" xlink:label="rr_StrategyNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyPortfolioConcentration" xlink:label="rr_StrategyPortfolioConcentration" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskHeading" xlink:label="rr_RiskHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNarrativeTextBlock" xlink:label="rr_RiskNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskFootnotesTextBlock" xlink:label="rr_RiskFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskClosingTextBlock" xlink:label="rr_RiskClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskLoseMoney" xlink:label="rr_RiskLoseMoney" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNondiversifiedStatus" xlink:label="rr_RiskNondiversifiedStatus" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskMoneyMarketFund" xlink:label="rr_RiskMoneyMarketFund" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNotInsuredDepositoryInstitution" xlink:label="rr_RiskNotInsuredDepositoryInstitution" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskCaption" xlink:label="rr_RiskCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskColumnName" xlink:label="rr_RiskColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_Risk" xlink:label="rr_Risk" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartAndPerformanceTableHeading" xlink:label="rr_BarChartAndPerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceNarrativeTextBlock" xlink:label="rr_PerformanceNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceInformationIllustratesVariabilityOfReturns" xlink:label="rr_PerformanceInformationIllustratesVariabilityOfReturns" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceOneYearOrLess" xlink:label="rr_PerformanceOneYearOrLess" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAdditionalMarketIndex" xlink:label="rr_PerformanceAdditionalMarketIndex" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAvailabilityPhone" xlink:label="rr_PerformanceAvailabilityPhone" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAvailabilityWebSiteAddress" xlink:label="rr_PerformanceAvailabilityWebSiteAddress" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformancePastDoesNotIndicateFuture" xlink:label="rr_PerformancePastDoesNotIndicateFuture" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHeading" xlink:label="rr_BarChartHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartNarrativeTextBlock" xlink:label="rr_BarChartNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartDoesNotReflectSalesLoads" xlink:label="rr_BarChartDoesNotReflectSalesLoads" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnCaption" xlink:label="rr_AnnualReturnCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnColumnName" xlink:label="rr_AnnualReturnColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturnInceptionDate" xlink:label="rr_AnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1990" xlink:label="rr_AnnualReturn1990" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1991" xlink:label="rr_AnnualReturn1991" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1992" xlink:label="rr_AnnualReturn1992" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1993" xlink:label="rr_AnnualReturn1993" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1994" xlink:label="rr_AnnualReturn1994" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1995" xlink:label="rr_AnnualReturn1995" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1996" xlink:label="rr_AnnualReturn1996" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1997" xlink:label="rr_AnnualReturn1997" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1998" xlink:label="rr_AnnualReturn1998" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn1999" xlink:label="rr_AnnualReturn1999" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2000" xlink:label="rr_AnnualReturn2000" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2001" xlink:label="rr_AnnualReturn2001" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2002" xlink:label="rr_AnnualReturn2002" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2003" xlink:label="rr_AnnualReturn2003" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2004" xlink:label="rr_AnnualReturn2004" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2005" xlink:label="rr_AnnualReturn2005" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2006" xlink:label="rr_AnnualReturn2006" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2007" xlink:label="rr_AnnualReturn2007" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2008" xlink:label="rr_AnnualReturn2008" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2009" xlink:label="rr_AnnualReturn2009" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2010" xlink:label="rr_AnnualReturn2010" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2011" xlink:label="rr_AnnualReturn2011" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2012" xlink:label="rr_AnnualReturn2012" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2013" xlink:label="rr_AnnualReturn2013" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2014" xlink:label="rr_AnnualReturn2014" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2015" xlink:label="rr_AnnualReturn2015" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2016" xlink:label="rr_AnnualReturn2016" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2017" xlink:label="rr_AnnualReturn2017" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2018" xlink:label="rr_AnnualReturn2018" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2019" xlink:label="rr_AnnualReturn2019" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2020" xlink:label="rr_AnnualReturn2020" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartFootnotesTextBlock" xlink:label="rr_BarChartFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartClosingTextBlock" xlink:label="rr_BarChartClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod" xlink:label="rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartReturnsForClassNotOfferedInProspectus" xlink:label="rr_BarChartReturnsForClassNotOfferedInProspectus" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_YearToDateReturnLabel" xlink:label="rr_YearToDateReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartYearToDateReturnDate" xlink:label="rr_BarChartYearToDateReturnDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartYearToDateReturn" xlink:label="rr_BarChartYearToDateReturn" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_HighestQuarterlyReturnLabel" xlink:label="rr_HighestQuarterlyReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHighestQuarterlyReturnDate" xlink:label="rr_BarChartHighestQuarterlyReturnDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHighestQuarterlyReturn" xlink:label="rr_BarChartHighestQuarterlyReturn" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_LowestQuarterlyReturnLabel" xlink:label="rr_LowestQuarterlyReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartLowestQuarterlyReturnDate" xlink:label="rr_BarChartLowestQuarterlyReturnDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartLowestQuarterlyReturn" xlink:label="rr_BarChartLowestQuarterlyReturn" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableHeading" xlink:label="rr_PerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableDoesReflectSalesLoads" xlink:label="rr_PerformanceTableDoesReflectSalesLoads" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableMarketIndexChanged" xlink:label="rr_PerformanceTableMarketIndexChanged" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_IndexNoDeductionForFeesExpensesTaxes" xlink:label="rr_IndexNoDeductionForFeesExpensesTaxes" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableUsesHighestFederalRate" xlink:label="rr_PerformanceTableUsesHighestFederalRate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNotRelevantToTaxDeferred" xlink:label="rr_PerformanceTableNotRelevantToTaxDeferred" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableOneClassOfAfterTaxShown" xlink:label="rr_PerformanceTableOneClassOfAfterTaxShown" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableExplanationAfterTaxHigher" xlink:label="rr_PerformanceTableExplanationAfterTaxHigher" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNarrativeTextBlock" xlink:label="rr_PerformanceTableNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod" xlink:label="rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesTextBlock" xlink:label="rr_PerformanceTableFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableClosingTextBlock" xlink:label="rr_PerformanceTableClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnCaption" xlink:label="rr_AverageAnnualReturnCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnColumnName" xlink:label="rr_AverageAnnualReturnColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnLabel" xlink:label="rr_AverageAnnualReturnLabel" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear01" xlink:label="rr_AverageAnnualReturnYear01" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear05" xlink:label="rr_AverageAnnualReturnYear05" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear10" xlink:label="rr_AverageAnnualReturnYear10" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnSinceInception" xlink:label="rr_AverageAnnualReturnSinceInception" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnInceptionDate" xlink:label="rr_AverageAnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYieldCaption" xlink:label="rr_MoneyMarketSevenDayYieldCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYieldColumnName" xlink:label="rr_MoneyMarketSevenDayYieldColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYieldPhone" xlink:label="rr_MoneyMarketSevenDayYieldPhone" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayYield" xlink:label="rr_MoneyMarketSevenDayYield" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MoneyMarketSevenDayTaxEquivalentYield" xlink:label="rr_MoneyMarketSevenDayTaxEquivalentYield" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYieldCaption" xlink:label="rr_ThirtyDayYieldCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYieldColumnName" xlink:label="rr_ThirtyDayYieldColumnName" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYieldPhone" xlink:label="rr_ThirtyDayYieldPhone" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayYield" xlink:label="rr_ThirtyDayYield" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ThirtyDayTaxEquivalentYield" xlink:label="rr_ThirtyDayTaxEquivalentYield" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_EntityRegistrantName" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusDate" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnHeading" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveHeading" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectivePrimaryTextBlock" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveSecondaryTextBlock" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseHeading" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseNarrativeTextBlock" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesCaption" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesColumnName" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOfferingPrice" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumCumulativeSalesChargeOverOther" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOfferingPrice" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumDeferredSalesChargeOverOther" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RedemptionFeeOverRedemption" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RedemptionFee" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExchangeFeeOverRedemption" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExchangeFee" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumAccountFeeOverAssets" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MaximumAccountFee" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeeOther" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesCaption" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesColumnName" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ManagementFeesOverAssets" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_DistributionAndService12b1FeesOverAssets" order="27" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_DistributionOrSimilarNon12b1FeesOverAssets" order="28" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Component1OtherExpensesOverAssets" order="29" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Component2OtherExpensesOverAssets" order="30" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Component3OtherExpensesOverAssets" order="31" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OtherExpensesOverAssets" order="32" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AcquiredFundFeesAndExpensesOverAssets" order="33" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesOverAssets" order="34" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssets" order="35" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_NetExpensesOverAssets" order="36" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" order="37" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverHeading" order="38" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverTextBlock" order="39" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverRate" order="40" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseFootnotesTextBlock" order="41" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesDeferredChargesTextBlock" order="42" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRangeOfExchangeFeesTextBlock" order="43" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseBreakpointDiscounts" order="44" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseBreakpointMinimumInvestmentRequiredAmount" order="45" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExchangeTradedFundCommissions" order="46" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRepresentBothMasterAndFeeder" order="47" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesExplanationOfNonrecurringAccountFee" order="48" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OtherExpensesNewFundBasedOnEstimates" order="49" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AcquiredFundFeesAndExpensesBasedOnEstimates" order="50" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded" order="51" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesRestatedToReflectCurrent" order="52" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees" order="53" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleHeading" order="54" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearHeading" order="55" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNarrativeTextBlock" order="56" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearCaption" order="57" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear01" order="58" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear03" order="59" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear05" order="60" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear10" order="61" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" order="62" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionByYearCaption" order="63" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear01" order="64" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear03" order="65" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear05" order="66" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNoRedemptionYear10" order="67" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleFootnotesTextBlock" order="68" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleClosingTextBlock" order="69" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyHeading" order="70" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyNarrativeTextBlock" order="71" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyPortfolioConcentration" order="72" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskHeading" order="73" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNarrativeTextBlock" order="74" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskFootnotesTextBlock" order="75" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskClosingTextBlock" order="76" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskLoseMoney" order="77" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNondiversifiedStatus" order="78" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskMoneyMarketFund" order="79" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNotInsuredDepositoryInstitution" order="80" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskCaption" order="81" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskColumnName" order="82" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_Risk" order="83" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartAndPerformanceTableHeading" order="84" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceNarrativeTextBlock" order="85" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceInformationIllustratesVariabilityOfReturns" order="86" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceOneYearOrLess" order="87" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAdditionalMarketIndex" order="88" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAvailabilityPhone" order="89" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAvailabilityWebSiteAddress" order="90" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformancePastDoesNotIndicateFuture" order="91" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHeading" order="92" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartNarrativeTextBlock" order="93" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartDoesNotReflectSalesLoads" order="94" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturnCaption" order="95" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturnColumnName" order="96" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturnInceptionDate" order="97" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1990" order="98" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1991" order="99" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1992" order="100" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1993" order="101" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1994" order="102" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1995" order="103" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1996" order="104" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1997" order="105" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1998" order="106" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn1999" order="107" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2000" order="108" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2001" order="109" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2002" order="110" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2003" order="111" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2004" order="112" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2005" order="113" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2006" order="114" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2007" order="115" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2008" order="116" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2009" order="117" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2010" order="118" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2011" order="119" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2012" order="120" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2013" order="121" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2014" order="122" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2015" order="123" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2016" order="124" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2017" order="125" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2018" order="126" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2019" order="127" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2020" order="128" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartFootnotesTextBlock" order="129" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartClosingTextBlock" order="130" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod" order="131" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartReturnsForClassNotOfferedInProspectus" order="132" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_YearToDateReturnLabel" order="133" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartYearToDateReturnDate" order="134" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartYearToDateReturn" order="135" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_HighestQuarterlyReturnLabel" order="136" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHighestQuarterlyReturnDate" order="137" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHighestQuarterlyReturn" order="138" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_LowestQuarterlyReturnLabel" order="139" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartLowestQuarterlyReturnDate" order="140" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartLowestQuarterlyReturn" order="141" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableHeading" order="142" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableDoesReflectSalesLoads" order="143" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableMarketIndexChanged" order="144" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_IndexNoDeductionForFeesExpensesTaxes" order="145" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableUsesHighestFederalRate" order="146" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNotRelevantToTaxDeferred" order="147" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableOneClassOfAfterTaxShown" order="148" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableExplanationAfterTaxHigher" order="149" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNarrativeTextBlock" order="150" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod" order="151" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesTextBlock" order="152" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableClosingTextBlock" order="153" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnCaption" order="154" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnColumnName" order="155" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnLabel" order="156" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear01" order="157" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear05" order="158" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear10" order="159" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnSinceInception" order="160" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnInceptionDate" order="161" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYieldCaption" order="162" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYieldColumnName" order="163" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYieldPhone" order="164" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayYield" order="165" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_MoneyMarketSevenDayTaxEquivalentYield" order="166" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYieldCaption" order="167" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYieldColumnName" order="168" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYieldPhone" order="169" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayYield" order="170" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ThirtyDayTaxEquivalentYield" order="171" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="2" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="3" />
  </link:definitionLink>
  <!-- Dimension Defaults -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DisclosureRiskReturnDetailDataElementsNASDAQ-100PROFUND" xlink:title="000049 - Disclosure - Risk/Return Detail Data {Elements} - NASDAQ-100 PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledLARGE-CAPVALUEPROFUND" xlink:title="000051 - Document - Risk/Return Summary {Unlabeled} - LARGE-CAP VALUE PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="1" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledLARGE-CAPVALUEPROFUND" xlink:title="000051 - Document - Risk/Return Summary {Unlabeled} - LARGE-CAP VALUE PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledLARGE-CAPVALUEPROFUND" xlink:title="000051 - Document - Risk/Return Summary {Unlabeled} - LARGE-CAP VALUE PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="2" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledLARGE-CAPVALUEPROFUND" xlink:title="000051 - Document - Risk/Return Summary {Unlabeled} - LARGE-CAP VALUE PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_AfterTaxesOnDistributionsMember" order="3" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledLARGE-CAPVALUEPROFUND" xlink:title="000051 - Document - Risk/Return Summary {Unlabeled} - LARGE-CAP VALUE PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="3" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledLARGE-CAPVALUEPROFUND" xlink:title="000051 - Document - Risk/Return Summary {Unlabeled} - LARGE-CAP VALUE PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_S000003071Member" xlink:label="pf4_S000003071Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pf4_S000003071Member" order="1" />
  </link:definitionLink>
  <!-- Hypercube Definition (Line Items to Hypercube)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledLARGE-CAPVALUEPROFUND" xlink:title="000051 - Document - Risk/Return Summary {Unlabeled} - LARGE-CAP VALUE PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="4" />
  </link:definitionLink>
  <!-- Domain Members -->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledLARGE-CAPVALUEPROFUND" xlink:title="000051 - Document - Risk/Return Summary {Unlabeled} - LARGE-CAP VALUE PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000012253Member" xlink:label="pf4_C000012253Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008358Member" xlink:label="pf4_C000008358Member" />
    <link:loc xlink:type="locator" xlink:href="pf4-20121128.xsd#pf4_C000008359Member" xlink:label="pf4_C000008359Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000012253Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008358Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="pf4_C000008359Member" order="4" />
  </link:definitionLink>
  <!-- Hypercube Definition (All)-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledLARGE-CAPVALUEPROFUND" xlink:title="000051 - Document - Risk/Return Summary {Unlabeled} - LARGE-CAP VALUE PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
  </link:definitionLink>
  <!-- Inheritance for Line Items:  rr:RiskReturnAbstract-->
  <link:definitionLink xlink:type="extended" xlink:role="http://www.ProFunds.com/role/DocumentRiskReturnSummaryUnlabeledLARGE-CAPVALUEPROFUND" xlink:title="000051 - Document - Risk/Return Summary {Unlabeled} - LARGE-CAP VALUE PROFUND">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnHeading" xlink:label="rr_RiskReturnHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveHeading" xlink:label="rr_ObjectiveHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectivePrimaryTextBlock" xlink:label="rr_ObjectivePrimaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveSecondaryTextBlock" xlink:label="rr_ObjectiveSecondaryTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseHeading" xlink:label="rr_ExpenseHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseNarrativeTextBlock" xlink:label="rr_ExpenseNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesCaption" xlink:label="rr_ShareholderFeesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesTableTextBlock" xlink:label="rr_ShareholderFeesTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesCaption" xlink:label="rr_OperatingExpensesCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualFundOperatingExpensesTableTextBlock" xlink:label="rr_AnnualFundOperatingExpensesTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseFootnotesTextBlock" xlink:label="rr_ExpenseFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesDeferredChargesTextBlock" xlink:label="rr_ExpensesDeferredChargesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesRangeOfExchangeFeesTextBlock" xlink:label="rr_ExpensesRangeOfExchangeFeesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleHeading" xlink:label="rr_ExpenseExampleHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearHeading" xlink:label="rr_ExpenseExampleByYearHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNarrativeTextBlock" xlink:label="rr_ExpenseExampleNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearCaption" xlink:label="rr_ExpenseExampleByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleWithRedemptionTableTextBlock" xlink:label="rr_ExpenseExampleWithRedemptionTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionNarrativeTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionByYearCaption" xlink:label="rr_ExpenseExampleNoRedemptionByYearCaption" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNoRedemptionTableTextBlock" xlink:label="rr_ExpenseExampleNoRedemptionTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleFootnotesTextBlock" xlink:label="rr_ExpenseExampleFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleClosingTextBlock" xlink:label="rr_ExpenseExampleClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverHeading" xlink:label="rr_PortfolioTurnoverHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverTextBlock" xlink:label="rr_PortfolioTurnoverTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyHeading" xlink:label="rr_StrategyHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyNarrativeTextBlock" xlink:label="rr_StrategyNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskHeading" xlink:label="rr_RiskHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNarrativeTextBlock" xlink:label="rr_RiskNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskFootnotesTextBlock" xlink:label="rr_RiskFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskClosingTextBlock" xlink:label="rr_RiskClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartAndPerformanceTableHeading" xlink:label="rr_BarChartAndPerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceNarrativeTextBlock" xlink:label="rr_PerformanceNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartNarrativeTextBlock" xlink:label="rr_BarChartNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHeading" xlink:label="rr_BarChartHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableTextBlock" xlink:label="rr_BarChartTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartFootnotesTextBlock" xlink:label="rr_BarChartFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartClosingTextBlock" xlink:label="rr_BarChartClosingTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableHeading" xlink:label="rr_PerformanceTableHeading" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableTextBlock" xlink:label="rr_PerformanceTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNarrativeTextBlock" xlink:label="rr_PerformanceTableNarrativeTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_MarketIndexPerformanceTableTextBlock" xlink:label="rr_MarketIndexPerformanceTableTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableFootnotesTextBlock" xlink:label="rr_PerformanceTableFootnotesTextBlock" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableClosingTextBlock" xlink:label="rr_PerformanceTableClosingTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnHeading" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveHeading" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectivePrimaryTextBlock" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveSecondaryTextBlock" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseHeading" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseNarrativeTextBlock" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesCaption" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesTableTextBlock" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesCaption" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/