<?xml version="1.0" encoding="US-ASCII"?>
<!-- EDGAR Online I-Metrix Xcelerate Taxonomy Definition Linkbase, based on XBRL 2.1  http://www.edgar-online.com/ -->
<!-- Version: 6.20.1 -->
<!-- Round: 1 -->
<!-- Creation date: 2012-11-22T12:06:40Z -->
<!-- Copyright (c) 2005-2011 EDGAR Online, Inc. All Rights Reserved. -->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
  xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <roleRef xlink:type="simple" xlink:href="ck0000811030-20120630.xsd#DocumentDocumentandEntityInformation" roleURI="http://www.portfolio21.com/role/DocumentDocumentandEntityInformation"/>
  <roleRef xlink:type="simple" xlink:href="ck0000811030-20120630.xsd#RiskReturn_S000004945Member" roleURI="http://www.portfolio21.com/role/RiskReturn_S000004945Member"/>
  <roleRef xlink:type="simple" xlink:href="ck0000811030-20120630.xsd#ShareholderFeesData_S000004945Member" roleURI="http://www.portfolio21.com/role/ShareholderFeesData_S000004945Member"/>
  <roleRef xlink:type="simple" xlink:href="ck0000811030-20120630.xsd#OperatingExpensesData_S000004945Member" roleURI="http://www.portfolio21.com/role/OperatingExpensesData_S000004945Member"/>
  <roleRef xlink:type="simple" xlink:href="ck0000811030-20120630.xsd#ExpenseExample_S000004945Member" roleURI="http://www.portfolio21.com/role/ExpenseExample_S000004945Member"/>
  <roleRef xlink:type="simple" xlink:href="ck0000811030-20120630.xsd#BarChartData_S000004945Member" roleURI="http://www.portfolio21.com/role/BarChartData_S000004945Member"/>
  <roleRef xlink:type="simple" xlink:href="ck0000811030-20120630.xsd#PerformanceTableData_S000004945Member" roleURI="http://www.portfolio21.com/role/PerformanceTableData_S000004945Member"/>
  <roleRef xlink:type="simple" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#RiskReturnDetailData" roleURI="http://xbrl.sec.gov/rr/role/RiskReturnDetailData"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all"/>
  <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"/>
  <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"/>
  <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"/>
  <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"/>
  <definitionLink xlink:type="extended" xlink:role="http://www.portfolio21.com/role/DocumentDocumentandEntityInformation">
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000013361Member" xlink:label="ck0000811030_C000013361Member"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000042370Member" xlink:label="ck0000811030_C000042370Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentCreationDate" xlink:label="dei_DocumentCreationDate"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentEffectiveDate" xlink:label="dei_DocumentEffectiveDate"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentType" xlink:label="dei_DocumentType"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_S000004945Member" xlink:label="ck0000811030_S000004945Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_SummaryS000004945Member" xlink:label="ck0000811030_SummaryS000004945Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_TradingSymbol" xlink:label="dei_TradingSymbol"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentDomain" xlink:to="ck0000811030_SummaryS000004945Member" order="2.2000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000811030_S000004945Member" order="2.1000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="100.0000" xbrldt:closed="true" xbrldt:contextElement="segment" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_DocumentType" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_DocumentPeriodEndDate" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_EntityRegistrantName" order="400.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_EntityCentralIndexKey" order="500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_AmendmentFlag" order="600.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_TradingSymbol" order="800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_DocumentCreationDate" order="900.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="dei_DocumentEffectiveDate" order="1000.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000013361Member" order="2.3000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000042370Member" order="2.4000" priority="2" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.portfolio21.com/role/RiskReturn_S000004945Member">
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualFundOperatingExpensesTableTextBlock" xlink:label="rr_AnnualFundOperatingExpensesTableTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnCaption" xlink:label="rr_AverageAnnualReturnCaption"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartAndPerformanceTableHeading" xlink:label="rr_BarChartAndPerformanceTableHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartClosingTextBlock" xlink:label="rr_BarChartClosingTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHeading" xlink:label="rr_BarChartHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableTextBlock" xlink:label="rr_BarChartTableTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearCaption" xlink:label="rr_ExpenseExampleByYearCaption"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleHeading" xlink:label="rr_ExpenseExampleHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNarrativeTextBlock" xlink:label="rr_ExpenseExampleNarrativeTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleWithRedemptionTableTextBlock" xlink:label="rr_ExpenseExampleWithRedemptionTableTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseHeading" xlink:label="rr_ExpenseHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseNarrativeTextBlock" xlink:label="rr_ExpenseNarrativeTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveHeading" xlink:label="rr_ObjectiveHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectivePrimaryTextBlock" xlink:label="rr_ObjectivePrimaryTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesCaption" xlink:label="rr_OperatingExpensesCaption"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceNarrativeTextBlock" xlink:label="rr_PerformanceNarrativeTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableClosingTextBlock" xlink:label="rr_PerformanceTableClosingTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableTextBlock" xlink:label="rr_PerformanceTableTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverHeading" xlink:label="rr_PortfolioTurnoverHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverTextBlock" xlink:label="rr_PortfolioTurnoverTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskHeading" xlink:label="rr_RiskHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNarrativeTextBlock" xlink:label="rr_RiskNarrativeTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnHeading" xlink:label="rr_RiskReturnHeading"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_S000004945Member" xlink:label="ck0000811030_S000004945Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesCaption" xlink:label="rr_ShareholderFeesCaption"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesTableTextBlock" xlink:label="rr_ShareholderFeesTableTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyHeading" xlink:label="rr_StrategyHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyNarrativeTextBlock" xlink:label="rr_StrategyNarrativeTextBlock"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_SummaryS000004945Member" xlink:label="ck0000811030_SummaryS000004945Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentDomain" xlink:to="ck0000811030_SummaryS000004945Member" order="2.2000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000811030_S000004945Member" order="2.1000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="1.0000" xbrldt:closed="true" xbrldt:contextElement="segment" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnHeading" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveHeading" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectivePrimaryTextBlock" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseHeading" order="500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseNarrativeTextBlock" order="600.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesCaption" order="700.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesTableTextBlock" order="800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesCaption" order="900.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualFundOperatingExpensesTableTextBlock" order="1000.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleHeading" order="1400.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNarrativeTextBlock" order="1600.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearCaption" order="1700.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleWithRedemptionTableTextBlock" order="1800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverHeading" order="2400.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverTextBlock" order="2500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyHeading" order="2600.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyNarrativeTextBlock" order="2700.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskHeading" order="2800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNarrativeTextBlock" order="2900.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartAndPerformanceTableHeading" order="3200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceNarrativeTextBlock" order="3300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHeading" order="3500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartTableTextBlock" order="3600.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartClosingTextBlock" order="3800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnCaption" order="4030.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableTextBlock" order="4100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableClosingTextBlock" order="4400.0000" priority="2" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.portfolio21.com/role/ShareholderFeesData_S000004945Member">
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000013361Member" xlink:label="ck0000811030_C000013361Member"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000042370Member" xlink:label="ck0000811030_C000042370Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFeeOverRedemption" xlink:label="rr_RedemptionFeeOverRedemption"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_S000004945Member" xlink:label="ck0000811030_S000004945Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesAbstract" xlink:label="rr_ShareholderFeesAbstract"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_SummaryS000004945Member" xlink:label="ck0000811030_SummaryS000004945Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentDomain" xlink:to="ck0000811030_SummaryS000004945Member" order="2.2000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000811030_S000004945Member" order="2.1000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000013361Member" order="2.3000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000042370Member" order="2.4000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ProspectusTable" order="1.0000" xbrldt:closed="true" xbrldt:contextElement="segment" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_RedemptionFeeOverRedemption" order="800.0000" priority="2" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.portfolio21.com/role/OperatingExpensesData_S000004945Member">
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000013361Member" xlink:label="ck0000811030_C000013361Member"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000042370Member" xlink:label="ck0000811030_C000042370Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionAndService12b1FeesOverAssets" xlink:label="rr_DistributionAndService12b1FeesOverAssets"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOverAssets" xlink:label="rr_ExpensesOverAssets"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ManagementFeesOverAssets" xlink:label="rr_ManagementFeesOverAssets"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesAbstract" xlink:label="rr_OperatingExpensesAbstract"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesOverAssets" xlink:label="rr_OtherExpensesOverAssets"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_S000004945Member" xlink:label="ck0000811030_S000004945Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_SummaryS000004945Member" xlink:label="ck0000811030_SummaryS000004945Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentDomain" xlink:to="ck0000811030_SummaryS000004945Member" order="2.2000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000811030_S000004945Member" order="2.1000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ProspectusTable" order="1.0000" xbrldt:closed="true" xbrldt:contextElement="segment" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ManagementFeesOverAssets" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_DistributionAndService12b1FeesOverAssets" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_OtherExpensesOverAssets" order="800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ExpensesOverAssets" order="1000.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000013361Member" order="2.3000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000042370Member" order="2.4000" priority="2" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.portfolio21.com/role/ExpenseExample_S000004945Member">
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000013361Member" xlink:label="ck0000811030_C000013361Member"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000042370Member" xlink:label="ck0000811030_C000042370Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleAbstract" xlink:label="rr_ExpenseExampleAbstract"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear01" xlink:label="rr_ExpenseExampleYear01"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear03" xlink:label="rr_ExpenseExampleYear03"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear05" xlink:label="rr_ExpenseExampleYear05"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear10" xlink:label="rr_ExpenseExampleYear10"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_S000004945Member" xlink:label="ck0000811030_S000004945Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_SummaryS000004945Member" xlink:label="ck0000811030_SummaryS000004945Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentDomain" xlink:to="ck0000811030_SummaryS000004945Member" order="2.2000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000811030_S000004945Member" order="2.1000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ProspectusTable" order="1.0000" xbrldt:closed="true" xbrldt:contextElement="segment" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear01" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear03" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear05" order="400.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear10" order="500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000013361Member" order="2.3000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000042370Member" order="2.4000" priority="2" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.portfolio21.com/role/BarChartData_S000004945Member">
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2003" xlink:label="rr_AnnualReturn2003"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2004" xlink:label="rr_AnnualReturn2004"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2005" xlink:label="rr_AnnualReturn2005"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2006" xlink:label="rr_AnnualReturn2006"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2007" xlink:label="rr_AnnualReturn2007"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2008" xlink:label="rr_AnnualReturn2008"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2009" xlink:label="rr_AnnualReturn2009"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2010" xlink:label="rr_AnnualReturn2010"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2011" xlink:label="rr_AnnualReturn2011"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartTableAbstract" xlink:label="rr_BarChartTableAbstract"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000013361Member" xlink:label="ck0000811030_C000013361Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain_2"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain_2"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_S000004945Member" xlink:label="ck0000811030_S000004945Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain_2"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_SummaryS000004945Member" xlink:label="ck0000811030_SummaryS000004945Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_ProspectusTable" order="1.0000" xbrldt:closed="true" xbrldt:contextElement="segment" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2003" order="1700.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2004" order="1800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2005" order="1900.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2006" order="2000.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2007" order="2100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2008" order="2200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2009" order="2300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2010" order="2400.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_BarChartTableAbstract" xlink:to="rr_AnnualReturn2011" order="2500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentDomain" xlink:to="ck0000811030_SummaryS000004945Member" order="2.2000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain_2" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000811030_S000004945Member" order="2.1000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain_2" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain_2" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000013361Member" order="2.3000" priority="2" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.portfolio21.com/role/PerformanceTableData_S000004945Member">
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnAbstract" xlink:label="rr_AverageAnnualReturnAbstract"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnLabel" xlink:label="rr_AverageAnnualReturnLabel"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear01" xlink:label="rr_AverageAnnualReturnYear01"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear05" xlink:label="rr_AverageAnnualReturnYear05"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear10" xlink:label="rr_AverageAnnualReturnYear10"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000013361Member" xlink:label="ck0000811030_C000013361Member"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000042370Member" xlink:label="ck0000811030_C000042370Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain_2"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_RRINDEX00001Member" xlink:label="ck0000811030_RRINDEX00001Member"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_RRINDEX00002Member" xlink:label="ck0000811030_RRINDEX00002Member"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_RRINDEX00003Member" xlink:label="ck0000811030_RRINDEX00003Member"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_S000004945Member" xlink:label="ck0000811030_S000004945Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_SummaryS000004945Member" xlink:label="ck0000811030_SummaryS000004945Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_ProspectusTable" order="1.0000" xbrldt:closed="true" xbrldt:contextElement="segment" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnLabel" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear01" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear05" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_AverageAnnualReturnAbstract" xlink:to="rr_AverageAnnualReturnYear10" order="400.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentDomain" xlink:to="ck0000811030_SummaryS000004945Member" order="2.2000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000811030_S000004945Member" order="2.1000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain_2" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_PerformanceMeasureDomain" xlink:to="rr_AfterTaxesOnDistributionsMember" order="2.3000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_PerformanceMeasureDomain" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2.4000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_PerformanceMeasureDomain" xlink:to="ck0000811030_RRINDEX00001Member" order="2.5000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_PerformanceMeasureDomain" xlink:to="ck0000811030_RRINDEX00002Member" order="2.6000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_PerformanceMeasureDomain" xlink:to="ck0000811030_RRINDEX00003Member" order="2.7000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="400.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000013361Member" order="-97.2000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000042370Member" order="-97.1000" priority="2" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/RiskReturnDetailData">
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsAndSalesMember" xlink:label="rr_AfterTaxesOnDistributionsAndSalesMember"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AfterTaxesOnDistributionsMember" xlink:label="rr_AfterTaxesOnDistributionsMember"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2003" xlink:label="rr_AnnualReturn2003"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2004" xlink:label="rr_AnnualReturn2004"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2005" xlink:label="rr_AnnualReturn2005"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2006" xlink:label="rr_AnnualReturn2006"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2007" xlink:label="rr_AnnualReturn2007"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2008" xlink:label="rr_AnnualReturn2008"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2009" xlink:label="rr_AnnualReturn2009"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2010" xlink:label="rr_AnnualReturn2010"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AnnualReturn2011" xlink:label="rr_AnnualReturn2011"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnCaption" xlink:label="rr_AverageAnnualReturnCaption"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnLabel" xlink:label="rr_AverageAnnualReturnLabel"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear01" xlink:label="rr_AverageAnnualReturnYear01"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear05" xlink:label="rr_AverageAnnualReturnYear05"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_AverageAnnualReturnYear10" xlink:label="rr_AverageAnnualReturnYear10"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartAndPerformanceTableHeading" xlink:label="rr_BarChartAndPerformanceTableHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartClosingTextBlock" xlink:label="rr_BarChartClosingTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHeading" xlink:label="rr_BarChartHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHighestQuarterlyReturn" xlink:label="rr_BarChartHighestQuarterlyReturn"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartHighestQuarterlyReturnDate" xlink:label="rr_BarChartHighestQuarterlyReturnDate"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartLowestQuarterlyReturn" xlink:label="rr_BarChartLowestQuarterlyReturn"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartLowestQuarterlyReturnDate" xlink:label="rr_BarChartLowestQuarterlyReturnDate"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartYearToDateReturn" xlink:label="rr_BarChartYearToDateReturn"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_BarChartYearToDateReturnDate" xlink:label="rr_BarChartYearToDateReturnDate"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000013361Member" xlink:label="ck0000811030_C000013361Member"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_C000042370Member" xlink:label="ck0000811030_C000042370Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_DistributionAndService12b1FeesOverAssets" xlink:label="rr_DistributionAndService12b1FeesOverAssets"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentDomain" xlink:label="dei_DocumentDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="dei_DocumentInformationDocumentAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleByYearCaption" xlink:label="rr_ExpenseExampleByYearCaption"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleHeading" xlink:label="rr_ExpenseExampleHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleNarrativeTextBlock" xlink:label="rr_ExpenseExampleNarrativeTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear01" xlink:label="rr_ExpenseExampleYear01"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear03" xlink:label="rr_ExpenseExampleYear03"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear05" xlink:label="rr_ExpenseExampleYear05"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseExampleYear10" xlink:label="rr_ExpenseExampleYear10"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseHeading" xlink:label="rr_ExpenseHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpenseNarrativeTextBlock" xlink:label="rr_ExpenseNarrativeTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ExpensesOverAssets" xlink:label="rr_ExpensesOverAssets"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" xlink:label="rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_HighestQuarterlyReturnLabel" xlink:label="rr_HighestQuarterlyReturnLabel"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_IndexNoDeductionForFeesExpensesTaxes" xlink:label="rr_IndexNoDeductionForFeesExpensesTaxes"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_LowestQuarterlyReturnLabel" xlink:label="rr_LowestQuarterlyReturnLabel"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ManagementFeesOverAssets" xlink:label="rr_ManagementFeesOverAssets"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectiveHeading" xlink:label="rr_ObjectiveHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ObjectivePrimaryTextBlock" xlink:label="rr_ObjectivePrimaryTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OperatingExpensesCaption" xlink:label="rr_OperatingExpensesCaption"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_OtherExpensesOverAssets" xlink:label="rr_OtherExpensesOverAssets"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceAvailabilityWebSiteAddress" xlink:label="rr_PerformanceAvailabilityWebSiteAddress"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceInformationIllustratesVariabilityOfReturns" xlink:label="rr_PerformanceInformationIllustratesVariabilityOfReturns"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureAxis" xlink:label="rr_PerformanceMeasureAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain" xlink:label="rr_PerformanceMeasureDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceNarrativeTextBlock" xlink:label="rr_PerformanceNarrativeTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformancePastDoesNotIndicateFuture" xlink:label="rr_PerformancePastDoesNotIndicateFuture"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableClosingTextBlock" xlink:label="rr_PerformanceTableClosingTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableExplanationAfterTaxHigher" xlink:label="rr_PerformanceTableExplanationAfterTaxHigher"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableNotRelevantToTaxDeferred" xlink:label="rr_PerformanceTableNotRelevantToTaxDeferred"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableOneClassOfAfterTaxShown" xlink:label="rr_PerformanceTableOneClassOfAfterTaxShown"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceTableUsesHighestFederalRate" xlink:label="rr_PerformanceTableUsesHighestFederalRate"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverHeading" xlink:label="rr_PortfolioTurnoverHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverRate" xlink:label="rr_PortfolioTurnoverRate"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PortfolioTurnoverTextBlock" xlink:label="rr_PortfolioTurnoverTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusDate" xlink:label="rr_ProspectusDate"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusShareClassAxis" xlink:label="rr_ProspectusShareClassAxis"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ProspectusTable" xlink:label="rr_ProspectusTable"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RedemptionFeeOverRedemption" xlink:label="rr_RedemptionFeeOverRedemption"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskHeading" xlink:label="rr_RiskHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskLoseMoney" xlink:label="rr_RiskLoseMoney"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskNarrativeTextBlock" xlink:label="rr_RiskNarrativeTextBlock"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnAbstract" xlink:label="rr_RiskReturnAbstract"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_RiskReturnHeading" xlink:label="rr_RiskReturnHeading"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_RRINDEX00001Member" xlink:label="ck0000811030_RRINDEX00001Member"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_RRINDEX00002Member" xlink:label="ck0000811030_RRINDEX00002Member"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_RRINDEX00003Member" xlink:label="ck0000811030_RRINDEX00003Member"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_S000004945Member" xlink:label="ck0000811030_S000004945Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain" xlink:label="rr_ShareClassDomain"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareholderFeesCaption" xlink:label="rr_ShareholderFeesCaption"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyHeading" xlink:label="rr_StrategyHeading"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_StrategyNarrativeTextBlock" xlink:label="rr_StrategyNarrativeTextBlock"/>
    <loc xlink:type="locator" xlink:href="ck0000811030-20120630.xsd#ck0000811030_SummaryS000004945Member" xlink:label="ck0000811030_SummaryS000004945Member"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_YearToDateReturnLabel" xlink:label="rr_YearToDateReturnLabel"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentDomain" xlink:to="ck0000811030_SummaryS000004945Member" order="-97.8000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_DocumentInformationDocumentAxis" xlink:to="dei_DocumentDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000811030_S000004945Member" order="2.1000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_PerformanceMeasureAxis" xlink:to="rr_PerformanceMeasureDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_PerformanceMeasureDomain" xlink:to="rr_AfterTaxesOnDistributionsMember" order="2.3000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_PerformanceMeasureDomain" xlink:to="rr_AfterTaxesOnDistributionsAndSalesMember" order="2.4000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_PerformanceMeasureDomain" xlink:to="ck0000811030_RRINDEX00001Member" order="2.5000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_PerformanceMeasureDomain" xlink:to="ck0000811030_RRINDEX00002Member" order="2.6000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_PerformanceMeasureDomain" xlink:to="ck0000811030_RRINDEX00003Member" order="2.7000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_DocumentInformationDocumentAxis" order="100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="rr_ProspectusTable" xlink:to="rr_PerformanceMeasureAxis" order="400.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusTable" order="1.0000" xbrldt:closed="true" xbrldt:contextElement="segment" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ProspectusDate" order="1000.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskReturnHeading" order="1100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectiveHeading" order="1200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ObjectivePrimaryTextBlock" order="1300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseHeading" order="1500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseNarrativeTextBlock" order="1600.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ShareholderFeesCaption" order="1700.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RedemptionFeeOverRedemption" order="2500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OperatingExpensesCaption" order="3200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ManagementFeesOverAssets" order="3400.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_DistributionAndService12b1FeesOverAssets" order="3500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_OtherExpensesOverAssets" order="4000.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpensesOverAssets" order="4200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination" order="4500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverHeading" order="4600.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverTextBlock" order="4700.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PortfolioTurnoverRate" order="4800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleHeading" order="6200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleNarrativeTextBlock" order="6400.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleByYearCaption" order="6500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear01" order="6600.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear03" order="6700.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear05" order="6800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_ExpenseExampleYear10" order="6900.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyHeading" order="7800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_StrategyNarrativeTextBlock" order="7900.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskHeading" order="8100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskNarrativeTextBlock" order="8200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_RiskLoseMoney" order="8500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartAndPerformanceTableHeading" order="9200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceNarrativeTextBlock" order="9300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceInformationIllustratesVariabilityOfReturns" order="9400.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceAvailabilityWebSiteAddress" order="9800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformancePastDoesNotIndicateFuture" order="9900.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHeading" order="10000.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2003" order="11900.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2004" order="12000.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2005" order="12100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2006" order="12200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2007" order="12300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2008" order="12400.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2009" order="12500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2010" order="12600.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AnnualReturn2011" order="12700.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartClosingTextBlock" order="13200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_YearToDateReturnLabel" order="13500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartYearToDateReturnDate" order="13600.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartYearToDateReturn" order="13700.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_HighestQuarterlyReturnLabel" order="13800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHighestQuarterlyReturnDate" order="13900.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartHighestQuarterlyReturn" order="14000.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_LowestQuarterlyReturnLabel" order="14100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartLowestQuarterlyReturnDate" order="14200.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_BarChartLowestQuarterlyReturn" order="14300.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_IndexNoDeductionForFeesExpensesTaxes" order="14700.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableUsesHighestFederalRate" order="14800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableNotRelevantToTaxDeferred" order="14900.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableOneClassOfAfterTaxShown" order="15000.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableExplanationAfterTaxHigher" order="15100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableClosingTextBlock" order="15500.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnCaption" order="15600.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnLabel" order="15800.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear01" order="15900.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear05" order="16000.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnYear10" order="16100.0000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000013361Member" order="2.8000" priority="2" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="rr_ShareClassDomain" xlink:to="ck0000811030_C000042370Member" order="2.9000" priority="2" use="optional"/>
  </definitionLink>
</linkbase>
