<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019c956f-4746-7e9c-8afe-f19f68a1c674,g:da379034-f92e-4d2e-b447-9b704428e9d3-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.celanese.com/role/Cover" xlink:type="simple" xlink:href="ce-20260331.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_019c956f-4ae2-7306-b2bf-296fcee09137" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntitiesTable_019c956f-4ae2-7306-b2bf-296fcee09137" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c956f-4ae2-7d02-807d-2aac37a2c766" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_019c956f-4ae2-7306-b2bf-296fcee09137" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c956f-4ae2-7d02-807d-2aac37a2c766" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c956f-4ae2-7d02-807d-2aac37a2c766_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c956f-4ae2-7d02-807d-2aac37a2c766" xlink:to="loc_us-gaap_ClassOfStockDomain_019c956f-4ae2-7d02-807d-2aac37a2c766_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c956f-4ae2-7471-93e7-98d9f2726127" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c956f-4ae2-7d02-807d-2aac37a2c766" xlink:to="loc_us-gaap_ClassOfStockDomain_019c956f-4ae2-7471-93e7-98d9f2726127" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c956f-4ae2-7620-b37e-8e65ab53db12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c956f-4ae2-7471-93e7-98d9f2726127" xlink:to="loc_us-gaap_CommonStockMember_019c956f-4ae2-7620-b37e-8e65ab53db12" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EURSeniorUnsecuredNotesDue2026Member_019c956f-4ae2-710d-9e87-e23ba38660a4" xlink:href="ce-20260331.xsd#ce_EURSeniorUnsecuredNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c956f-4ae2-7471-93e7-98d9f2726127" xlink:to="loc_ce_EURSeniorUnsecuredNotesDue2026Member_019c956f-4ae2-710d-9e87-e23ba38660a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EURSeniorUnsecuredNotesDue2027Member_019c956f-4ae2-7135-9e16-7152e202a51d" xlink:href="ce-20260331.xsd#ce_EURSeniorUnsecuredNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c956f-4ae2-7471-93e7-98d9f2726127" xlink:to="loc_ce_EURSeniorUnsecuredNotesDue2027Member_019c956f-4ae2-7135-9e16-7152e202a51d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EURSeniorUnsecuredNotesDue2028Member_019c956f-4ae2-7118-a6e0-6af3c8823ed6" xlink:href="ce-20260331.xsd#ce_EURSeniorUnsecuredNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c956f-4ae2-7471-93e7-98d9f2726127" xlink:to="loc_ce_EURSeniorUnsecuredNotesDue2028Member_019c956f-4ae2-7118-a6e0-6af3c8823ed6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EURSeniorUnsecuredNotesDue2029Member_019c956f-4ae2-7725-b933-f2f63012788a" xlink:href="ce-20260331.xsd#ce_EURSeniorUnsecuredNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c956f-4ae2-7471-93e7-98d9f2726127" xlink:to="loc_ce_EURSeniorUnsecuredNotesDue2029Member_019c956f-4ae2-7725-b933-f2f63012788a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EURSeniorUnsecuredNotesDue2031Member_019c956f-4ae2-7782-84af-7054f244ee5c" xlink:href="ce-20260331.xsd#ce_EURSeniorUnsecuredNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c956f-4ae2-7471-93e7-98d9f2726127" xlink:to="loc_ce_EURSeniorUnsecuredNotesDue2031Member_019c956f-4ae2-7782-84af-7054f244ee5c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019c956f-4ae2-71c4-b36f-960f35107697" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_DocumentType_019c956f-4ae2-71c4-b36f-960f35107697" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019c956f-4ae2-70b6-84ac-d15cb92c445e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_DocumentQuarterlyReport_019c956f-4ae2-70b6-84ac-d15cb92c445e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019c956f-4ae2-7712-9b5a-302e4e954d1d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_DocumentPeriodEndDate_019c956f-4ae2-7712-9b5a-302e4e954d1d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019c956f-4ae2-7d8f-a528-448a0a81389b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_DocumentTransitionReport_019c956f-4ae2-7d8f-a528-448a0a81389b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019c956f-4ae2-7aae-8d08-5f09987fc1af" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityFileNumber_019c956f-4ae2-7aae-8d08-5f09987fc1af" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019c956f-4ae2-777c-9b0c-4de143b1bf68" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityRegistrantName_019c956f-4ae2-777c-9b0c-4de143b1bf68" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019c956f-4ae2-708e-a196-e4d8debf33b1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019c956f-4ae2-708e-a196-e4d8debf33b1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019c956f-4ae2-7d24-acfe-afc8e624fe1d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityTaxIdentificationNumber_019c956f-4ae2-7d24-acfe-afc8e624fe1d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019c956f-4ae2-7191-b989-b52d89a4e627" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityAddressAddressLine1_019c956f-4ae2-7191-b989-b52d89a4e627" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019c956f-4ae2-721b-a95b-9d0060105187" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityAddressCityOrTown_019c956f-4ae2-721b-a95b-9d0060105187" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019c956f-4ae2-73e7-9303-03f8a227f6ad" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityAddressStateOrProvince_019c956f-4ae2-73e7-9303-03f8a227f6ad" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019c956f-4ae2-78e3-9e4a-fa917d47e8ba" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityAddressPostalZipCode_019c956f-4ae2-78e3-9e4a-fa917d47e8ba" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019c956f-4ae2-7c05-9387-3b6d19bb4e12" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_CityAreaCode_019c956f-4ae2-7c05-9387-3b6d19bb4e12" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019c956f-4ae2-7288-a705-96fce7adc3da" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_LocalPhoneNumber_019c956f-4ae2-7288-a705-96fce7adc3da" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019c956f-4ae2-7f0a-a978-08a7d2a5dd88" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_Security12bTitle_019c956f-4ae2-7f0a-a978-08a7d2a5dd88" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019c956f-4ae2-7afb-99fd-8f79d4ce09bf" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_TradingSymbol_019c956f-4ae2-7afb-99fd-8f79d4ce09bf" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019c956f-4ae2-7661-8f07-856ffc929bd4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_SecurityExchangeName_019c956f-4ae2-7661-8f07-856ffc929bd4" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019c956f-4ae2-73e2-9e14-a50a8dc181f3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityCurrentReportingStatus_019c956f-4ae2-73e2-9e14-a50a8dc181f3" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019c956f-4ae2-75e1-9827-23c204c05155" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityInteractiveDataCurrent_019c956f-4ae2-75e1-9827-23c204c05155" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019c956f-4ae2-709e-a064-d4d79adeb085" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityFilerCategory_019c956f-4ae2-709e-a064-d4d79adeb085" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019c956f-4ae2-7d8e-a109-ffed47ce4cbb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntitySmallBusiness_019c956f-4ae2-7d8e-a109-ffed47ce4cbb" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019c956f-4ae2-7983-b08b-5a50428f23ed" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityEmergingGrowthCompany_019c956f-4ae2-7983-b08b-5a50428f23ed" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019c956f-4ae2-7fc0-a9a4-c9c11edea9bb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityShellCompany_019c956f-4ae2-7fc0-a9a4-c9c11edea9bb" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019c956f-4ae2-7b60-91fe-fb484a60612c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019c956f-4ae2-7b60-91fe-fb484a60612c" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019c956f-4ae2-7382-a1e2-79a280926f26" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_EntityCentralIndexKey_019c956f-4ae2-7382-a1e2-79a280926f26" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019c956f-4b84-761f-b35d-b0ad216b0b93" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_CurrentFiscalYearEndDate_019c956f-4b84-761f-b35d-b0ad216b0b93" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019c956f-4b84-7a74-b3b2-8960908476f7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_DocumentFiscalYearFocus_019c956f-4b84-7a74-b3b2-8960908476f7" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019c956f-4b84-7418-9732-f600c9a388e9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019c956f-4b84-7418-9732-f600c9a388e9" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019c956f-4b84-784d-b821-dc087e837f13" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019c956f-4ae2-7104-9b25-a204713cd31f" xlink:to="loc_dei_AmendmentFlag_019c956f-4b84-784d-b821-dc087e837f13" xlink:type="arc" order="28"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/UnauditedInterimConsolidatedStatementEquity" xlink:type="simple" xlink:href="ce-20260331.xsd#UnauditedInterimConsolidatedStatementEquity"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/UnauditedInterimConsolidatedStatementEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c956f-4b84-71e2-b542-55f084adf63d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c956f-4b84-7576-8940-e5bff72be5fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c956f-4b84-71e2-b542-55f084adf63d" xlink:to="loc_us-gaap_StatementTable_019c956f-4b84-7576-8940-e5bff72be5fc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c956f-4b84-7fb0-9a0c-7c7fc3f9e032" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c956f-4b84-7576-8940-e5bff72be5fc" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c956f-4b84-7fb0-9a0c-7c7fc3f9e032" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c956f-4b84-7fb0-9a0c-7c7fc3f9e032_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c956f-4b84-7fb0-9a0c-7c7fc3f9e032" xlink:to="loc_us-gaap_EquityComponentDomain_019c956f-4b84-7fb0-9a0c-7c7fc3f9e032_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c956f-4b84-7a90-ac0b-3d87b9b543dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c956f-4b84-7fb0-9a0c-7c7fc3f9e032" xlink:to="loc_us-gaap_EquityComponentDomain_019c956f-4b84-7a90-ac0b-3d87b9b543dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c956f-4b84-7131-8a10-12eb107194fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c956f-4b84-7a90-ac0b-3d87b9b543dc" xlink:to="loc_us-gaap_CommonStockMember_019c956f-4b84-7131-8a10-12eb107194fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019c956f-4b84-71c3-91d1-cac2408e5a35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c956f-4b84-7a90-ac0b-3d87b9b543dc" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019c956f-4b84-71c3-91d1-cac2408e5a35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019c956f-4b84-7c86-879b-208422326229" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c956f-4b84-7a90-ac0b-3d87b9b543dc" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019c956f-4b84-7c86-879b-208422326229" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019c956f-4b84-7c57-8dc7-482f49828db6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c956f-4b84-7a90-ac0b-3d87b9b543dc" xlink:to="loc_us-gaap_RetainedEarningsMember_019c956f-4b84-7c57-8dc7-482f49828db6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c956f-4b84-76a0-a00c-55f317c97957" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c956f-4b84-7a90-ac0b-3d87b9b543dc" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c956f-4b84-76a0-a00c-55f317c97957" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c956f-4b84-71e2-b542-55f084adf63d" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019c956f-4b84-7369-a0ef-5e6eebf229c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_TreasuryStockCommonShares_019c956f-4b84-7369-a0ef-5e6eebf229c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_019c956f-4b84-7e99-a879-10738056f8b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_SharesIssued_019c956f-4b84-7e99-a879-10738056f8b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c956f-4b84-7e48-aec0-171c61060984" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_StockholdersEquity_019c956f-4b84-7e48-aec0-171c61060984" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019c956f-4b84-7341-9ee7-67b6d660f3cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019c956f-4b84-7341-9ee7-67b6d660f3cf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_019c956f-4b84-71b4-bc55-afd7e942906f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_019c956f-4b84-71b4-bc55-afd7e942906f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_019c956f-4b84-7dea-bb0e-4a073f3f22d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_019c956f-4b84-7dea-bb0e-4a073f3f22d0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_019c956f-4b84-783b-836b-b988ee6406ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_019c956f-4b84-783b-836b-b988ee6406ab" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019c956f-4b84-79d2-a448-dbf726221054" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019c956f-4b84-79d2-a448-dbf726221054" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019c956f-4b84-7230-ac17-ca63c46318aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019c956f-4b84-7230-ac17-ca63c46318aa" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019c956f-4b84-7ea7-9405-6482194db162" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019c956f-4b84-7ea7-9405-6482194db162" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019c956f-4b84-72ed-889b-9b54b7600e90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_NetIncomeLoss_019c956f-4b84-72ed-889b-9b54b7600e90" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_019c956f-4b84-734d-9a01-40983665b974" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_DividendsCommonStock_019c956f-4b84-734d-9a01-40983665b974" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c956f-4b84-7f41-b9fa-69e2a7da899e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c956f-4b84-7f41-b9fa-69e2a7da899e" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_019c956f-4b84-7090-87d2-0ef012448484" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesIssued"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c956f-4b84-76d8-9a39-82b57664a8f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019c956f-4b84-7e88-843a-1f12f52ab9a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_019c956f-4b84-7f68-897a-42ed5b053e69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_MinorityInterest_019c956f-4b84-7f68-897a-42ed5b053e69" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019c956f-4b84-799b-b849-61cab369ce7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019c956f-4b84-799b-b849-61cab369ce7b" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_019c956f-4b84-71d6-8000-4348f618af05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_019c956f-4b84-71d6-8000-4348f618af05" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_019c956f-4b84-7cf9-ba12-6a27f886c542" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_019c956f-4b84-7cf9-ba12-6a27f886c542" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_019c956f-4b84-7b1b-a36c-2a3a20b815ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c956f-4b84-70d1-a5c5-a2788a21f9ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c956f-4b84-7cab-a9a7-c9caff5cd86a" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c956f-4b84-70d1-a5c5-a2788a21f9ef" xlink:type="arc" order="22"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/DescriptionoftheCompanyandBasisofPresentationNarrativeDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#DescriptionoftheCompanyandBasisofPresentationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/DescriptionoftheCompanyandBasisofPresentationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019c956f-4b84-787e-8d97-a79a1788e47f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c956f-4b84-7969-bd54-ff6a1888f1ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c956f-4b84-787e-8d97-a79a1788e47f" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c956f-4b84-7969-bd54-ff6a1888f1ff" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_019c956f-4b84-791e-8b9e-b14ecbbcd558" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c956f-4b84-7969-bd54-ff6a1888f1ff" xlink:to="loc_srt_OwnershipAxis_019c956f-4b84-791e-8b9e-b14ecbbcd558" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019c956f-4b84-791e-8b9e-b14ecbbcd558_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_019c956f-4b84-791e-8b9e-b14ecbbcd558" xlink:to="loc_srt_OwnershipDomain_019c956f-4b84-791e-8b9e-b14ecbbcd558_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019c956f-4b84-7de4-9705-47f2e6046f54" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_019c956f-4b84-791e-8b9e-b14ecbbcd558" xlink:to="loc_srt_OwnershipDomain_019c956f-4b84-7de4-9705-47f2e6046f54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_ConsolidatedVenturesMember_019c956f-4b84-71fe-8010-28a76fb3d765" xlink:href="ce-20260331.xsd#ce_ConsolidatedVenturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019c956f-4b84-7de4-9705-47f2e6046f54" xlink:to="loc_ce_ConsolidatedVenturesMember_019c956f-4b84-71fe-8010-28a76fb3d765" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_019ddcb5-b180-76fa-9be0-87a783e08171" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c956f-4b84-7969-bd54-ff6a1888f1ff" xlink:to="loc_srt_RestatementAxis_019ddcb5-b180-76fa-9be0-87a783e08171" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_019ddcb5-b180-76fa-9be0-87a783e08171_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_019ddcb5-b180-76fa-9be0-87a783e08171" xlink:to="loc_srt_RestatementDomain_019ddcb5-b180-76fa-9be0-87a783e08171_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_019ddcb5-b180-7a80-89f1-47cc79d2b638" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_019ddcb5-b180-76fa-9be0-87a783e08171" xlink:to="loc_srt_RestatementDomain_019ddcb5-b180-7a80-89f1-47cc79d2b638" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember_019ddcb5-b180-70aa-9e70-9f6302cec960" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_019ddcb5-b180-7a80-89f1-47cc79d2b638" xlink:to="loc_srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember_019ddcb5-b180-70aa-9e70-9f6302cec960" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_019c956f-4b84-76b8-ae2c-53161d1eb769" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c956f-4b84-787e-8d97-a79a1788e47f" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_019c956f-4b84-76b8-ae2c-53161d1eb769" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019ddcb5-b180-7d70-9b9f-6488d9143509" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c956f-4b84-787e-8d97-a79a1788e47f" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019ddcb5-b180-7d70-9b9f-6488d9143509" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/AcquisitionsDispositionsandPlantClosuresPlantClosuresNarrativeDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#AcquisitionsDispositionsandPlantClosuresPlantClosuresNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/AcquisitionsDispositionsandPlantClosuresPlantClosuresNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019ddc99-24ef-71b5-8388-9e65ad7330d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019ddc99-24ef-77b7-99b9-ae0091bb3ac0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ddc99-24ef-71b5-8388-9e65ad7330d8" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019ddc99-24ef-77b7-99b9-ae0091bb3ac0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019ddc99-24ef-74bf-b895-62d95fd59340" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019ddc99-24ef-77b7-99b9-ae0091bb3ac0" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019ddc99-24ef-74bf-b895-62d95fd59340" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019ddc99-24ef-74bf-b895-62d95fd59340_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019ddc99-24ef-74bf-b895-62d95fd59340" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019ddc99-24ef-74bf-b895-62d95fd59340_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019ddc99-24ef-793d-a5a7-653eaae33677" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019ddc99-24ef-74bf-b895-62d95fd59340" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019ddc99-24ef-793d-a5a7-653eaae33677" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_019ddc99-24ef-7f10-9423-0b6b1de70308" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019ddc99-24ef-793d-a5a7-653eaae33677" xlink:to="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_019ddc99-24ef-7f10-9423-0b6b1de70308" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019ddc99-24ef-73b1-87c2-e083bd08ccd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019ddc99-24ef-77b7-99b9-ae0091bb3ac0" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019ddc99-24ef-73b1-87c2-e083bd08ccd6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019ddc99-24ef-73b1-87c2-e083bd08ccd6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019ddc99-24ef-73b1-87c2-e083bd08ccd6" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019ddc99-24ef-73b1-87c2-e083bd08ccd6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019ddc99-24ef-7d35-9974-5632727e58a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019ddc99-24ef-73b1-87c2-e083bd08ccd6" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019ddc99-24ef-7d35-9974-5632727e58a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_MicromaxMember_019ddc99-24ef-7e61-9a17-f834f4662be7" xlink:href="ce-20260331.xsd#ce_MicromaxMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019ddc99-24ef-7d35-9974-5632727e58a0" xlink:to="loc_ce_MicromaxMember_019ddc99-24ef-7e61-9a17-f834f4662be7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_019ddc99-24ef-7689-81ec-c8e9e60d35bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ddc99-24ef-71b5-8388-9e65ad7330d8" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_019ddc99-24ef-7689-81ec-c8e9e60d35bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_019ddc99-24ef-7623-9ff5-aff4244fedc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ddc99-24ef-71b5-8388-9e65ad7330d8" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_019ddc99-24ef-7623-9ff5-aff4244fedc4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/AcquisitionsDispositionsandPlantClosuresPlantClosuresScheduleofExitandShutdownCostRelatedtoClosureDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#AcquisitionsDispositionsandPlantClosuresPlantClosuresScheduleofExitandShutdownCostRelatedtoClosureDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/AcquisitionsDispositionsandPlantClosuresPlantClosuresScheduleofExitandShutdownCostRelatedtoClosureDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019ddc99-db71-7299-aefa-1badd53228ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c956f-4b84-759a-b64f-f869fbe8e5c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019ddc99-db71-7299-aefa-1badd53228ce" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c956f-4b84-759a-b64f-f869fbe8e5c2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019ddc99-db71-71e9-b399-994d9686a4ab" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c956f-4b84-759a-b64f-f869fbe8e5c2" xlink:to="loc_srt_StatementGeographicalAxis_019ddc99-db71-71e9-b399-994d9686a4ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019ddc99-db71-71e9-b399-994d9686a4ab_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019ddc99-db71-71e9-b399-994d9686a4ab" xlink:to="loc_srt_SegmentGeographicalDomain_019ddc99-db71-71e9-b399-994d9686a4ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019ddc99-db71-77b8-9db2-eefd016c1c60" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019ddc99-db71-71e9-b399-994d9686a4ab" xlink:to="loc_srt_SegmentGeographicalDomain_019ddc99-db71-77b8-9db2-eefd016c1c60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_LanakenBelgiumMember_019ddc99-db71-780a-98b4-17bb5a7ec9d4" xlink:href="ce-20260331.xsd#ce_LanakenBelgiumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ddc99-db71-77b8-9db2-eefd016c1c60" xlink:to="loc_ce_LanakenBelgiumMember_019ddc99-db71-780a-98b4-17bb5a7ec9d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019ddc99-db71-7cc8-a350-a71232c670b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c956f-4b84-759a-b64f-f869fbe8e5c2" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019ddc99-db71-7cc8-a350-a71232c670b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019ddc99-db71-7cc8-a350-a71232c670b5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019ddc99-db71-7cc8-a350-a71232c670b5" xlink:to="loc_us-gaap_SegmentDomain_019ddc99-db71-7cc8-a350-a71232c670b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019ddc99-db71-74d3-ada7-8664680c82ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019ddc99-db71-7cc8-a350-a71232c670b5" xlink:to="loc_us-gaap_SegmentDomain_019ddc99-db71-74d3-ada7-8664680c82ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_AcetylChainMember_019ddc99-db71-70ba-89f1-ac00b0db9616" xlink:href="ce-20260331.xsd#ce_AcetylChainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019ddc99-db71-74d3-ada7-8664680c82ca" xlink:to="loc_ce_AcetylChainMember_019ddc99-db71-70ba-89f1-ac00b0db9616" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019ddc99-db71-7929-b3c6-154f8e777290" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019ddc99-db71-7299-aefa-1badd53228ce" xlink:to="loc_us-gaap_RestructuringCharges_019ddc99-db71-7929-b3c6-154f8e777290" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveAcceleratedDepreciation_019ddc99-db71-76b1-81cf-eb18fd102efe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserveAcceleratedDepreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019ddc99-db71-7299-aefa-1badd53228ce" xlink:to="loc_us-gaap_RestructuringReserveAcceleratedDepreciation_019ddc99-db71-76b1-81cf-eb18fd102efe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_PlantShutdownCosts_019ddc99-db71-77d7-88de-3f35a168f967" xlink:href="ce-20260331.xsd#ce_PlantShutdownCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019ddc99-db71-7299-aefa-1badd53228ce" xlink:to="loc_ce_PlantShutdownCosts_019ddc99-db71-77d7-88de-3f35a168f967" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_019ddc99-f5c6-7d1b-945c-ac219f93bd0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019ddc99-db71-7299-aefa-1badd53228ce" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_019ddc99-f5c6-7d1b-945c-ac219f93bd0a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/GoodwillandIntangibleAssetsNetScheduleofGoodwillDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#GoodwillandIntangibleAssetsNetScheduleofGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/GoodwillandIntangibleAssetsNetScheduleofGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_019c956f-4b84-7905-91ca-26469bd0fdf3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_019c956f-4b84-7053-89a3-3cc57a92adad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_019c956f-4b84-7905-91ca-26469bd0fdf3" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_019c956f-4b84-7053-89a3-3cc57a92adad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4b84-7694-b4b6-6d69ae1dfa60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_019c956f-4b84-7053-89a3-3cc57a92adad" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4b84-7694-b4b6-6d69ae1dfa60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c956f-4b84-7694-b4b6-6d69ae1dfa60_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4b84-7694-b4b6-6d69ae1dfa60" xlink:to="loc_us-gaap_SegmentDomain_019c956f-4b84-7694-b4b6-6d69ae1dfa60_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c956f-4b84-7448-a1e7-d0c58a6adffa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4b84-7694-b4b6-6d69ae1dfa60" xlink:to="loc_us-gaap_SegmentDomain_019c956f-4b84-7448-a1e7-d0c58a6adffa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EngineeredMaterialsMember_019c956f-4b84-7f7b-9bed-ba1294152c94" xlink:href="ce-20260331.xsd#ce_EngineeredMaterialsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c956f-4b84-7448-a1e7-d0c58a6adffa" xlink:to="loc_ce_EngineeredMaterialsMember_019c956f-4b84-7f7b-9bed-ba1294152c94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_AcetylChainMember_019c956f-4b84-71a2-8582-9d2f4d474c71" xlink:href="ce-20260331.xsd#ce_AcetylChainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c956f-4b84-7448-a1e7-d0c58a6adffa" xlink:to="loc_ce_AcetylChainMember_019c956f-4b84-71a2-8582-9d2f4d474c71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_019c956f-4b84-7963-91ce-a1a428ee4e9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019c956f-4b84-7905-91ca-26469bd0fdf3" xlink:to="loc_us-gaap_GoodwillRollForward_019c956f-4b84-7963-91ce-a1a428ee4e9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c956f-4b84-7905-b82f-361a3bd69630" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019c956f-4b84-7963-91ce-a1a428ee4e9b" xlink:to="loc_us-gaap_Goodwill_019c956f-4b84-7905-b82f-361a3bd69630" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillTransfers_019c956f-4b84-7448-82ea-f121f8ff277d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillTransfers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019c956f-4b84-7963-91ce-a1a428ee4e9b" xlink:to="loc_us-gaap_GoodwillTransfers_019c956f-4b84-7448-82ea-f121f8ff277d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments_019c956f-4b84-7871-9da4-c3a20a4bc6cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019c956f-4b84-7963-91ce-a1a428ee4e9b" xlink:to="loc_us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments_019c956f-4b84-7871-9da4-c3a20a4bc6cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c956f-4b84-7b79-a9e4-5f4988191bd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_019c956f-4b84-76fe-acc6-2b1ea49eb7e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019c956f-4b84-7905-91ca-26469bd0fdf3" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_019c956f-4b84-76fe-acc6-2b1ea49eb7e1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/GoodwillandIntangibleAssetsNetScheduleofFiniteLivedIntangibleAssetsDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#GoodwillandIntangibleAssetsNetScheduleofFiniteLivedIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/GoodwillandIntangibleAssetsNetScheduleofFiniteLivedIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c956f-4b84-72ee-b4df-7340423302d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019c956f-4b84-7844-afae-e9c59ff6dcac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c956f-4b84-72ee-b4df-7340423302d2" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019c956f-4b84-7844-afae-e9c59ff6dcac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c956f-4b84-7da6-9a60-e0c702dfac66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019c956f-4b84-7844-afae-e9c59ff6dcac" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c956f-4b84-7da6-9a60-e0c702dfac66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7da6-9a60-e0c702dfac66_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c956f-4b84-7da6-9a60-e0c702dfac66" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7da6-9a60-e0c702dfac66_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7fba-a98e-26100d65f935" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c956f-4b84-7da6-9a60-e0c702dfac66" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7fba-a98e-26100d65f935" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicensingAgreementsMember_019c956f-4b84-76bd-b6eb-5cc9e53f5f95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LicensingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7fba-a98e-26100d65f935" xlink:to="loc_us-gaap_LicensingAgreementsMember_019c956f-4b84-76bd-b6eb-5cc9e53f5f95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019c956f-4b84-718e-965a-97ad85e86731" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7fba-a98e-26100d65f935" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019c956f-4b84-718e-965a-97ad85e86731" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_019c956f-4b84-7431-a5bd-81eb4342a2e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7fba-a98e-26100d65f935" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_019c956f-4b84-7431-a5bd-81eb4342a2e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_019c956f-4b84-74ec-affd-d19307ed9720" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7fba-a98e-26100d65f935" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_019c956f-4b84-74ec-affd-d19307ed9720" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c956f-4b84-75ad-a2b0-2918a32944c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c956f-4b84-72ee-b4df-7340423302d2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c956f-4b84-75ad-a2b0-2918a32944c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019c956f-4b84-7b97-80a6-3c1c0fc19b9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c956f-4b84-75ad-a2b0-2918a32944c2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019c956f-4b84-7b97-80a6-3c1c0fc19b9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss_019c956f-4b84-772a-be72-bc44b26a31d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c956f-4b84-75ad-a2b0-2918a32944c2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss_019c956f-4b84-772a-be72-bc44b26a31d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019c956f-4b84-7222-8439-2fd82a33f75e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019c956f-4b84-7bfb-bd9b-16885bc135c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c956f-4b84-75ad-a2b0-2918a32944c2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019c956f-4b84-7bfb-bd9b-16885bc135c8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019c956f-4b84-7212-abeb-f99df56af5f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c956f-4b84-75ad-a2b0-2918a32944c2" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019c956f-4b84-7212-abeb-f99df56af5f5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments_019c956f-4b84-7cfe-b55f-69f48b2de084" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c956f-4b84-75ad-a2b0-2918a32944c2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments_019c956f-4b84-7cfe-b55f-69f48b2de084" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019c956f-4b84-7eac-8900-4b647e03aaa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019c956f-4b84-74ca-bdd1-64063b29ffe7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c956f-4b84-72ee-b4df-7340423302d2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019c956f-4b84-74ca-bdd1-64063b29ffe7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsCostIncurredToRenewOrExtend_019c956f-4b84-7751-8309-ce759da1b3b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsCostIncurredToRenewOrExtend"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c956f-4b84-72ee-b4df-7340423302d2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsCostIncurredToRenewOrExtend_019c956f-4b84-7751-8309-ce759da1b3b1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/GoodwillandIntangibleAssetsNetScheduleofIndefiniteLivedIntangibleAssetsDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#GoodwillandIntangibleAssetsNetScheduleofIndefiniteLivedIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/GoodwillandIntangibleAssetsNetScheduleofIndefiniteLivedIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019c956f-4b84-7edc-a1ef-4eecc80234d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_019c956f-4b84-7841-9972-abe218d3ab41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019c956f-4b84-7edc-a1ef-4eecc80234d9" xlink:to="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_019c956f-4b84-7841-9972-abe218d3ab41" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019c956f-4b84-7b4d-af60-7e309b831a3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_019c956f-4b84-7841-9972-abe218d3ab41" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019c956f-4b84-7b4d-af60-7e309b831a3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7b4d-af60-7e309b831a3c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019c956f-4b84-7b4d-af60-7e309b831a3c" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7b4d-af60-7e309b831a3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7114-86f5-0677179c9eb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019c956f-4b84-7b4d-af60-7e309b831a3c" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7114-86f5-0677179c9eb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_019c956f-4b84-735e-9e17-be718368a008" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019c956f-4b84-7114-86f5-0677179c9eb4" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_019c956f-4b84-735e-9e17-be718368a008" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019c956f-4b84-7e2e-ab1e-e3399ecb7919" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019c956f-4b84-7edc-a1ef-4eecc80234d9" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019c956f-4b84-7e2e-ab1e-e3399ecb7919" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss_019c956f-4b84-72a5-bc0c-241b1d19f0ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019c956f-4b84-7edc-a1ef-4eecc80234d9" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss_019c956f-4b84-72a5-bc0c-241b1d19f0ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019c956f-4b84-7d9e-bb7c-dc7e4c9a6583" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/DebtScheduleofShorttermDebtDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#DebtScheduleofShorttermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/DebtScheduleofShorttermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtLineItems_019c956f-4b84-7a28-beb6-4be2da63f35b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShortTermDebtTable_019c956f-4b84-789c-a3cb-12bd8cc98cda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShortTermDebtTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019c956f-4b84-7a28-beb6-4be2da63f35b" xlink:to="loc_us-gaap_ScheduleOfShortTermDebtTable_019c956f-4b84-789c-a3cb-12bd8cc98cda" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c956f-4b84-7a27-bd7d-9cb79639de34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_019c956f-4b84-789c-a3cb-12bd8cc98cda" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c956f-4b84-7a27-bd7d-9cb79639de34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4b84-7a27-bd7d-9cb79639de34_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c956f-4b84-7a27-bd7d-9cb79639de34" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4b84-7a27-bd7d-9cb79639de34_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4b84-79b8-8c28-11aa10a90ff9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c956f-4b84-7a27-bd7d-9cb79639de34" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4b84-79b8-8c28-11aa10a90ff9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtMember_019c956f-4b84-7f4e-8860-48d0250fc347" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4b84-79b8-8c28-11aa10a90ff9" xlink:to="loc_us-gaap_ShortTermDebtMember_019c956f-4b84-7f4e-8860-48d0250fc347" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c956f-4b84-7cf4-9754-2fbe1cc505d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4b84-79b8-8c28-11aa10a90ff9" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c956f-4b84-7cf4-9754-2fbe1cc505d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrentAbstract_019c956f-4b84-737c-8944-1590d5680e77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019c956f-4b84-7a28-beb6-4be2da63f35b" xlink:to="loc_us-gaap_DebtCurrentAbstract_019c956f-4b84-737c-8944-1590d5680e77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_019c956f-4b84-7209-a46e-253596200eb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtCurrentAbstract_019c956f-4b84-737c-8944-1590d5680e77" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_019c956f-4b84-7209-a46e-253596200eb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherShortTermBorrowings_019c956f-4b84-7901-94e9-ec8b65ccf33b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtCurrentAbstract_019c956f-4b84-737c-8944-1590d5680e77" xlink:to="loc_us-gaap_OtherShortTermBorrowings_019c956f-4b84-7901-94e9-ec8b65ccf33b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LinesOfCreditCurrent_019c956f-4b84-7f45-8f55-e3bff0b9404e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LinesOfCreditCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtCurrentAbstract_019c956f-4b84-737c-8944-1590d5680e77" xlink:to="loc_us-gaap_LinesOfCreditCurrent_019c956f-4b84-7f45-8f55-e3bff0b9404e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_019c956f-4b84-76fa-aa8a-1046efe5d159" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtCurrentAbstract_019c956f-4b84-737c-8944-1590d5680e77" xlink:to="loc_us-gaap_DebtCurrent_019c956f-4b84-76fa-aa8a-1046efe5d159" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtWeightedAverageInterestRate_019c956f-4b84-7305-a751-45838597eb31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtCurrentAbstract_019c956f-4b84-737c-8944-1590d5680e77" xlink:to="loc_us-gaap_ShortTermDebtWeightedAverageInterestRate_019c956f-4b84-7305-a751-45838597eb31" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/DebtScheduleofLongtermDebtDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#DebtScheduleofLongtermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/DebtScheduleofLongtermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019ddc9d-d4c9-729d-9a2c-45bc71e316e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c956f-4b84-7364-bcab-38445d8eb435" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddc9d-d4c9-729d-9a2c-45bc71e316e4" xlink:to="loc_us-gaap_DebtInstrumentTable_019c956f-4b84-7364-bcab-38445d8eb435" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019ddc9d-d4c9-7a9b-bba3-4d7bd5d5bfe2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c956f-4b84-7364-bcab-38445d8eb435" xlink:to="loc_us-gaap_DebtInstrumentAxis_019ddc9d-d4c9-7a9b-bba3-4d7bd5d5bfe2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-7a9b-bba3-4d7bd5d5bfe2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019ddc9d-d4c9-7a9b-bba3-4d7bd5d5bfe2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-7a9b-bba3-4d7bd5d5bfe2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019ddc9d-d4c9-7a9b-bba3-4d7bd5d5bfe2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USDSeniorUnsecuredNotesDue2026Member_019ddc9d-d4c9-73f8-87cd-07fbed9367e7" xlink:href="ce-20260331.xsd#ce_USDSeniorUnsecuredNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_USDSeniorUnsecuredNotesDue2026Member_019ddc9d-d4c9-73f8-87cd-07fbed9367e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EURSeniorUnsecuredNotesDue2026Member_019ddc9d-d4c9-7655-9571-b5c76d253cd4" xlink:href="ce-20260331.xsd#ce_EURSeniorUnsecuredNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_EURSeniorUnsecuredNotesDue2026Member_019ddc9d-d4c9-7655-9571-b5c76d253cd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EURSeniorUnsecuredNotesDue2027Member_019ddc9d-d4c9-797a-b52b-d595f211d0c9" xlink:href="ce-20260331.xsd#ce_EURSeniorUnsecuredNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_EURSeniorUnsecuredNotesDue2027Member_019ddc9d-d4c9-797a-b52b-d595f211d0c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USDSeniorUnsecuredNotesDue2027Member_019ddc9d-d4c9-73b0-86eb-9186a71fea49" xlink:href="ce-20260331.xsd#ce_USDSeniorUnsecuredNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_USDSeniorUnsecuredNotesDue2027Member_019ddc9d-d4c9-73b0-86eb-9186a71fea49" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EURSeniorUnsecuredNotesDue2028Member_019ddc9d-d4c9-7e6e-a266-d2b6d16b5b15" xlink:href="ce-20260331.xsd#ce_EURSeniorUnsecuredNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_EURSeniorUnsecuredNotesDue2028Member_019ddc9d-d4c9-7e6e-a266-d2b6d16b5b15" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USDSeniorUnsecuredNotesDue2028Member_019ddc9d-d4c9-798a-8b0d-d2a3ff64422b" xlink:href="ce-20260331.xsd#ce_USDSeniorUnsecuredNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_USDSeniorUnsecuredNotesDue2028Member_019ddc9d-d4c9-798a-8b0d-d2a3ff64422b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EURSeniorUnsecuredNotesDue2029Member_019ddc9d-d4c9-76ec-894e-82e7e55356e3" xlink:href="ce-20260331.xsd#ce_EURSeniorUnsecuredNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_EURSeniorUnsecuredNotesDue2029Member_019ddc9d-d4c9-76ec-894e-82e7e55356e3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USDSeniorUnsecuredNotesDue2029Member_019ddc9d-d4c9-7980-bb46-ae6db5cb1ffe" xlink:href="ce-20260331.xsd#ce_USDSeniorUnsecuredNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_USDSeniorUnsecuredNotesDue2029Member_019ddc9d-d4c9-7980-bb46-ae6db5cb1ffe" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USD700MSeniorUnsecuredNotesDue2030Member_019ddc9d-d4c9-7139-a08a-c8c4d8e2b443" xlink:href="ce-20260331.xsd#ce_USD700MSeniorUnsecuredNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_USD700MSeniorUnsecuredNotesDue2030Member_019ddc9d-d4c9-7139-a08a-c8c4d8e2b443" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USDSeniorUnsecuredNotesDue2030Member_019ddc9d-d4c9-7825-a3cb-c41af3d261a4" xlink:href="ce-20260331.xsd#ce_USDSeniorUnsecuredNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_USDSeniorUnsecuredNotesDue2030Member_019ddc9d-d4c9-7825-a3cb-c41af3d261a4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USDSeniorUnsecuredNotesDue2031Member_019ddc9d-d4c9-700f-94ee-e31b95884ee8" xlink:href="ce-20260331.xsd#ce_USDSeniorUnsecuredNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_USDSeniorUnsecuredNotesDue2031Member_019ddc9d-d4c9-700f-94ee-e31b95884ee8" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EURSeniorUnsecuredNotesDue2031Member_019ddc9d-d4c9-7a91-a1a0-739c9e2e7fdd" xlink:href="ce-20260331.xsd#ce_EURSeniorUnsecuredNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_EURSeniorUnsecuredNotesDue2031Member_019ddc9d-d4c9-7a91-a1a0-739c9e2e7fdd" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USDSeniorUnsecuredNotesDue2032Member_019ddc9d-d4c9-75fd-b4df-d6b7e5f46b20" xlink:href="ce-20260331.xsd#ce_USDSeniorUnsecuredNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_USDSeniorUnsecuredNotesDue2032Member_019ddc9d-d4c9-75fd-b4df-d6b7e5f46b20" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USDSeniorUnsecuredNotesDue2033Member_019ddc9d-d4c9-7b8e-bdc9-00a83d3b2719" xlink:href="ce-20260331.xsd#ce_USDSeniorUnsecuredNotesDue2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_USDSeniorUnsecuredNotesDue2033Member_019ddc9d-d4c9-7b8e-bdc9-00a83d3b2719" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USD1.1BSeniorUnsecuredNotesDue2033Member_019ddc9d-d4c9-7305-98e5-bee05a36cabd" xlink:href="ce-20260331.xsd#ce_USD1.1BSeniorUnsecuredNotesDue2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_USD1.1BSeniorUnsecuredNotesDue2033Member_019ddc9d-d4c9-7305-98e5-bee05a36cabd" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USDSeniorUnsecuredNotesDue2034Member_019ddc9d-d4c9-7bed-9bd0-8e49d153c60f" xlink:href="ce-20260331.xsd#ce_USDSeniorUnsecuredNotesDue2034Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_USDSeniorUnsecuredNotesDue2034Member_019ddc9d-d4c9-7bed-9bd0-8e49d153c60f" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_PollutionControlAndIndustrialRevenueBondsMember_019ddc9d-d4c9-7263-9c40-ec83cf9f3b9d" xlink:href="ce-20260331.xsd#ce_PollutionControlAndIndustrialRevenueBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_PollutionControlAndIndustrialRevenueBondsMember_019ddc9d-d4c9-7263-9c40-ec83cf9f3b9d" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_019ddc9d-d4c9-71ab-90d3-df9e7b43c19f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_us-gaap_LoansPayableMember_019ddc9d-d4c9-71ab-90d3-df9e7b43c19f" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_VariousSeniorNotesMember_019ddc9e-3e40-795e-bd91-87765cfea115" xlink:href="ce-20260331.xsd#ce_VariousSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddc9d-d4c9-73c5-8681-5fd28819352f" xlink:to="loc_ce_VariousSeniorNotesMember_019ddc9e-3e40-795e-bd91-87765cfea115" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019ddc9e-3e40-74e7-88f4-ecf527c2cacc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c956f-4b84-7364-bcab-38445d8eb435" xlink:to="loc_srt_RangeAxis_019ddc9e-3e40-74e7-88f4-ecf527c2cacc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ddc9e-3e40-74e7-88f4-ecf527c2cacc_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019ddc9e-3e40-74e7-88f4-ecf527c2cacc" xlink:to="loc_srt_RangeMember_019ddc9e-3e40-74e7-88f4-ecf527c2cacc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ddc9e-3e40-7684-af94-ebc6ea049182" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019ddc9e-3e40-74e7-88f4-ecf527c2cacc" xlink:to="loc_srt_RangeMember_019ddc9e-3e40-7684-af94-ebc6ea049182" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019ddc9e-3e40-7549-b4c2-0251bb337bf4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ddc9e-3e40-7684-af94-ebc6ea049182" xlink:to="loc_srt_MaximumMember_019ddc9e-3e40-7549-b4c2-0251bb337bf4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019ddc9e-3e40-7b83-96de-104f4083c87e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ddc9e-3e40-7684-af94-ebc6ea049182" xlink:to="loc_srt_MinimumMember_019ddc9e-3e40-7b83-96de-104f4083c87e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt_019ddc9d-d4c9-79ea-84c3-37e5be667e87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddc9d-d4c9-729d-9a2c-45bc71e316e4" xlink:to="loc_us-gaap_UnsecuredDebt_019ddc9d-d4c9-79ea-84c3-37e5be667e87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019ddc9e-1e7c-7856-81bc-04b9c93a2739" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddc9d-d4c9-729d-9a2c-45bc71e316e4" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019ddc9e-1e7c-7856-81bc-04b9c93a2739" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebt_019ddc9d-d4c9-7dc1-8d5b-cad94fba3d01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddc9d-d4c9-729d-9a2c-45bc71e316e4" xlink:to="loc_us-gaap_OtherLongTermDebt_019ddc9d-d4c9-7dc1-8d5b-cad94fba3d01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_019ddc9d-d4c9-76c4-a501-f925e119a604" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddc9d-d4c9-729d-9a2c-45bc71e316e4" xlink:to="loc_us-gaap_FinanceLeaseLiability_019ddc9d-d4c9-76c4-a501-f925e119a604" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_019ddc9d-d4c9-7b98-9e51-79dd23f7ecd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddc9d-d4c9-729d-9a2c-45bc71e316e4" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_019ddc9d-d4c9-7b98-9e51-79dd23f7ecd6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_019ddc9d-d4c9-789b-af61-c345a2549204" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddc9d-d4c9-729d-9a2c-45bc71e316e4" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_019ddc9d-d4c9-789b-af61-c345a2549204" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_019ddc9d-d4c9-71ce-a4d6-7e7e141ca9ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddc9d-d4c9-729d-9a2c-45bc71e316e4" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_019ddc9d-d4c9-71ce-a4d6-7e7e141ca9ab" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_019ddc9d-d4c9-78c0-acec-f2544becfe8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddc9d-d4c9-729d-9a2c-45bc71e316e4" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_019ddc9d-d4c9-78c0-acec-f2544becfe8d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateIncreaseDecrease_019ddc9e-3e40-7ff4-aa3f-9505ca649bcd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddc9d-d4c9-729d-9a2c-45bc71e316e4" xlink:to="loc_us-gaap_DebtInstrumentInterestRateIncreaseDecrease_019ddc9e-3e40-7ff4-aa3f-9505ca649bcd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_019ddc9e-3e40-7941-adf3-f1bf94f8d4d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddc9d-d4c9-729d-9a2c-45bc71e316e4" xlink:to="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_019ddc9e-3e40-7941-adf3-f1bf94f8d4d3" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c956f-4b84-775d-b50a-e42912e130c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_us-gaap_DebtInstrumentTable_019c956f-4b84-775d-b50a-e42912e130c1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019ddca2-4176-71da-905a-6eead5e17b5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c956f-4b84-775d-b50a-e42912e130c1" xlink:to="loc_us-gaap_DebtInstrumentAxis_019ddca2-4176-71da-905a-6eead5e17b5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-71da-905a-6eead5e17b5d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019ddca2-4176-71da-905a-6eead5e17b5d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-71da-905a-6eead5e17b5d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019ddca2-4176-71da-905a-6eead5e17b5d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_March2022U.S.TermLoanCreditAgreementMember_019ddca2-4176-73a6-a8fe-8ad8f43321eb" xlink:href="ce-20260331.xsd#ce_March2022U.S.TermLoanCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_March2022U.S.TermLoanCreditAgreementMember_019ddca2-4176-73a6-a8fe-8ad8f43321eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_November2024USTermLoanCreditAgreementMember_019ddca2-4176-760f-86c9-b1b22d6e3956" xlink:href="ce-20260331.xsd#ce_November2024USTermLoanCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_November2024USTermLoanCreditAgreementMember_019ddca2-4176-760f-86c9-b1b22d6e3956" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019ddca2-4176-77e4-bfc7-84c4236a410f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019ddca2-4176-77e4-bfc7-84c4236a410f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCRevolvingCreditAgreementMember_019ddca2-5f77-77aa-924e-476711e39e96" xlink:href="ce-20260331.xsd#ce_CNCCRevolvingCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_CNCCRevolvingCreditAgreementMember_019ddca2-5f77-77aa-924e-476711e39e96" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCCNY950MTermLoanAgreementMember_019ddca2-5f77-7de0-82f9-7a571cb635ef" xlink:href="ce-20260331.xsd#ce_CNCCCNY950MTermLoanAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_CNCCCNY950MTermLoanAgreementMember_019ddca2-5f77-7de0-82f9-7a571cb635ef" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EURSeniorUnsecuredNotesDue2031Member_019ddca2-7cf3-73b2-9057-6d65b816c6f8" xlink:href="ce-20260331.xsd#ce_EURSeniorUnsecuredNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_EURSeniorUnsecuredNotesDue2031Member_019ddca2-7cf3-73b2-9057-6d65b816c6f8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_March2025OfferingOfUSDSeniorUnsecuredNotesMember_019ddca2-7cf3-7ec4-a11d-3f154190fbfa" xlink:href="ce-20260331.xsd#ce_March2025OfferingOfUSDSeniorUnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_March2025OfferingOfUSDSeniorUnsecuredNotesMember_019ddca2-7cf3-7ec4-a11d-3f154190fbfa" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EURSeniorUnsecuredNotesDue2026Member_019ddca2-7cf3-74ae-b8b9-469dd903542d" xlink:href="ce-20260331.xsd#ce_EURSeniorUnsecuredNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_EURSeniorUnsecuredNotesDue2026Member_019ddca2-7cf3-74ae-b8b9-469dd903542d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USDSeniorUnsecuredNotesDue2027Member_019ddca2-7cf3-740a-b0be-57222103e265" xlink:href="ce-20260331.xsd#ce_USDSeniorUnsecuredNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_USDSeniorUnsecuredNotesDue2027Member_019ddca2-7cf3-740a-b0be-57222103e265" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_March2025OfferingOfSeniorUnsecuredNotesMember_019ddca2-7cf3-751d-9ac1-fd0958503707" xlink:href="ce-20260331.xsd#ce_March2025OfferingOfSeniorUnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_March2025OfferingOfSeniorUnsecuredNotesMember_019ddca2-7cf3-751d-9ac1-fd0958503707" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_March2025TenderOffersMember_019ddca2-7cf3-7dca-81fe-0eb959c35c31" xlink:href="ce-20260331.xsd#ce_March2025TenderOffersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_March2025TenderOffersMember_019ddca2-7cf3-7dca-81fe-0eb959c35c31" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_December2025OfferingOfSeniorUnsecuredNotesMember_019ddca2-7cf3-71d9-8474-01b75e6c1624" xlink:href="ce-20260331.xsd#ce_December2025OfferingOfSeniorUnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_December2025OfferingOfSeniorUnsecuredNotesMember_019ddca2-7cf3-71d9-8474-01b75e6c1624" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_December2025TenderOffersMember_019ddca2-7cf3-7922-ac11-1c6edf6ae50a" xlink:href="ce-20260331.xsd#ce_December2025TenderOffersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_December2025TenderOffersMember_019ddca2-7cf3-7922-ac11-1c6edf6ae50a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019ddca2-9bcc-7036-a116-f2d0b73ecb1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_us-gaap_SecuredDebtMember_019ddca2-9bcc-7036-a116-f2d0b73ecb1d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EuropeFactoringAgreementsMember_019ddca2-9bcc-7d84-b392-a284283e3771" xlink:href="ce-20260331.xsd#ce_EuropeFactoringAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_EuropeFactoringAgreementsMember_019ddca2-9bcc-7d84-b392-a284283e3771" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_JapanFactoringAgreementsMember_019ddca2-9bcc-737d-8e1c-99f326646006" xlink:href="ce-20260331.xsd#ce_JapanFactoringAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_JapanFactoringAgreementsMember_019ddca2-9bcc-737d-8e1c-99f326646006" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_SingaporeFactoringAgreementsMember_019ddca2-9bcc-76e2-aa02-3bd0234652bc" xlink:href="ce-20260331.xsd#ce_SingaporeFactoringAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_SingaporeFactoringAgreementsMember_019ddca2-9bcc-76e2-aa02-3bd0234652bc" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_ChinaFactoringAgreementsMember_019ddca2-9bcc-7470-9bfa-8e0398bd593e" xlink:href="ce-20260331.xsd#ce_ChinaFactoringAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_ChinaFactoringAgreementsMember_019ddca2-9bcc-7470-9bfa-8e0398bd593e" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_ChinaEuropeJapanAndSingaporeFactoringAgreementsMember_019ddca2-bd88-73bf-9d54-9e42dd4b8686" xlink:href="ce-20260331.xsd#ce_ChinaEuropeJapanAndSingaporeFactoringAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_ChinaEuropeJapanAndSingaporeFactoringAgreementsMember_019ddca2-bd88-73bf-9d54-9e42dd4b8686" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_MasterDiscountingAgreementMember_019ddca2-bd88-7f48-bbc6-af9fde38a270" xlink:href="ce-20260331.xsd#ce_MasterDiscountingAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019ddca2-4176-7be4-8e2e-c1e52fd629b8" xlink:to="loc_ce_MasterDiscountingAgreementMember_019ddca2-bd88-7f48-bbc6-af9fde38a270" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019ddca2-4176-73a7-9ff8-27f8bed80b6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c956f-4b84-775d-b50a-e42912e130c1" xlink:to="loc_us-gaap_CreditFacilityAxis_019ddca2-4176-73a7-9ff8-27f8bed80b6c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019ddca2-4176-73a7-9ff8-27f8bed80b6c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019ddca2-4176-73a7-9ff8-27f8bed80b6c" xlink:to="loc_us-gaap_CreditFacilityDomain_019ddca2-4176-73a7-9ff8-27f8bed80b6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019ddca2-4176-78eb-b1c0-eaaf5d4e0aa0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019ddca2-4176-73a7-9ff8-27f8bed80b6c" xlink:to="loc_us-gaap_CreditFacilityDomain_019ddca2-4176-78eb-b1c0-eaaf5d4e0aa0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019ddca2-4176-7b3a-87aa-189d64852391" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019ddca2-4176-78eb-b1c0-eaaf5d4e0aa0" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019ddca2-4176-7b3a-87aa-189d64852391" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_ChinaRevolvingCreditFacilitiesMember_019ddca2-5f77-7642-a8b3-adcc762a81a8" xlink:href="ce-20260331.xsd#ce_ChinaRevolvingCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019ddca2-4176-78eb-b1c0-eaaf5d4e0aa0" xlink:to="loc_ce_ChinaRevolvingCreditFacilitiesMember_019ddca2-5f77-7642-a8b3-adcc762a81a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_ChinaCreditFacilitiesMember_019ddca2-5f77-790e-afd3-66a8dbb5a4be" xlink:href="ce-20260331.xsd#ce_ChinaCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019ddca2-4176-78eb-b1c0-eaaf5d4e0aa0" xlink:to="loc_ce_ChinaCreditFacilitiesMember_019ddca2-5f77-790e-afd3-66a8dbb5a4be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_AmendedRestatedReceivablePurchasingFacilityMember_019ddca2-9bcc-79dc-a4fd-515ff0ebdc35" xlink:href="ce-20260331.xsd#ce_AmendedRestatedReceivablePurchasingFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019ddca2-4176-78eb-b1c0-eaaf5d4e0aa0" xlink:to="loc_ce_AmendedRestatedReceivablePurchasingFacilityMember_019ddca2-9bcc-79dc-a4fd-515ff0ebdc35" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019ddca2-4176-75c0-93a9-aa402d8a0a11" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c956f-4b84-775d-b50a-e42912e130c1" xlink:to="loc_srt_RangeAxis_019ddca2-4176-75c0-93a9-aa402d8a0a11" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ddca2-4176-75c0-93a9-aa402d8a0a11_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019ddca2-4176-75c0-93a9-aa402d8a0a11" xlink:to="loc_srt_RangeMember_019ddca2-4176-75c0-93a9-aa402d8a0a11_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ddca2-4176-772c-9b93-615ffb89a5ac" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019ddca2-4176-75c0-93a9-aa402d8a0a11" xlink:to="loc_srt_RangeMember_019ddca2-4176-772c-9b93-615ffb89a5ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019ddca2-4176-799b-a667-04f14180fdf2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ddca2-4176-772c-9b93-615ffb89a5ac" xlink:to="loc_srt_MinimumMember_019ddca2-4176-799b-a667-04f14180fdf2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019ddca2-4176-7aee-9f36-fe7d3a465fdf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ddca2-4176-772c-9b93-615ffb89a5ac" xlink:to="loc_srt_MaximumMember_019ddca2-4176-7aee-9f36-fe7d3a465fdf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019ddca2-4176-7a29-b42a-0b93d391c9f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c956f-4b84-775d-b50a-e42912e130c1" xlink:to="loc_us-gaap_VariableRateAxis_019ddca2-4176-7a29-b42a-0b93d391c9f4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019ddca2-4176-7a29-b42a-0b93d391c9f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019ddca2-4176-7a29-b42a-0b93d391c9f4" xlink:to="loc_us-gaap_VariableRateDomain_019ddca2-4176-7a29-b42a-0b93d391c9f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019ddca2-4176-7427-a07e-9087a2053c33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019ddca2-4176-7a29-b42a-0b93d391c9f4" xlink:to="loc_us-gaap_VariableRateDomain_019ddca2-4176-7427-a07e-9087a2053c33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_VariableInterbankInterestRateMember_019ddca2-4176-7df5-a3e9-4efd0a088b10" xlink:href="ce-20260331.xsd#ce_VariableInterbankInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019ddca2-4176-7427-a07e-9087a2053c33" xlink:to="loc_ce_VariableInterbankInterestRateMember_019ddca2-4176-7df5-a3e9-4efd0a088b10" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_019ddca2-4177-7576-95f4-7abd7b4855a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019ddca2-4176-7427-a07e-9087a2053c33" xlink:to="loc_us-gaap_BaseRateMember_019ddca2-4177-7576-95f4-7abd7b4855a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt_019ddca2-4177-7f86-8e5e-e37bad0bf237" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_us-gaap_UnsecuredDebt_019ddca2-4177-7f86-8e5e-e37bad0bf237" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019ddca2-4177-73ba-85d9-667565c6f30a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019ddca2-4177-73ba-85d9-667565c6f30a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019ddca2-4177-7961-bf6c-caf48ce24766" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019ddca2-4177-7961-bf6c-caf48ce24766" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019ddca2-5f77-747e-a8bd-37b4420343a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_us-gaap_DebtInstrumentTerm_019ddca2-5f77-747e-a8bd-37b4420343a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019ddca2-7cf3-7061-913f-883a90d1b7b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019ddca2-7cf3-7061-913f-883a90d1b7b8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_019ddca2-7cf3-7746-b471-eaf3156be487" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_019ddca2-7cf3-7746-b471-eaf3156be487" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_019ddca2-7cf3-7b1a-9446-5ca0183790eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_019ddca2-7cf3-7b1a-9446-5ca0183790eb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_019ddca2-7cf3-7ed2-9a18-30268b62e5ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_019ddca2-7cf3-7ed2-9a18-30268b62e5ff" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_PercentageOfFairValueOfSalesReceivables_019ddca2-9bcc-7db8-b7f8-62b11ffea35f" xlink:href="ce-20260331.xsd#ce_PercentageOfFairValueOfSalesReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_ce_PercentageOfFairValueOfSalesReceivables_019ddca2-9bcc-7db8-b7f8-62b11ffea35f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferOfFinancialAssetsAccountedForAsSalesAmountDerecognized_019ddca2-9bcc-7299-9257-92252b848491" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransferOfFinancialAssetsAccountedForAsSalesAmountDerecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_us-gaap_TransferOfFinancialAssetsAccountedForAsSalesAmountDerecognized_019ddca2-9bcc-7299-9257-92252b848491" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_ProceedsCollectedOnAccountsReceivableSoldUnderFactoringFacilities_019ddca2-9bcc-7e2f-8655-d358e641d1dd" xlink:href="ce-20260331.xsd#ce_ProceedsCollectedOnAccountsReceivableSoldUnderFactoringFacilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_ce_ProceedsCollectedOnAccountsReceivableSoldUnderFactoringFacilities_019ddca2-9bcc-7e2f-8655-d358e641d1dd" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_TradeReceivablesPledgedAsCollateral_019ddca2-9bcc-71ed-a66a-abc6ab06023a" xlink:href="ce-20260331.xsd#ce_TradeReceivablesPledgedAsCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_ce_TradeReceivablesPledgedAsCollateral_019ddca2-9bcc-71ed-a66a-abc6ab06023a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_TransferOfFinancialAssetsTreatedAsSalesNonRecourseOrLimitedRecourseBasisAccountsReceivablePercentage_019ddca2-9bcc-7d84-a7b7-f998a45f27b2" xlink:href="ce-20260331.xsd#ce_TransferOfFinancialAssetsTreatedAsSalesNonRecourseOrLimitedRecourseBasisAccountsReceivablePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ddca2-4177-7ad3-b942-23d58727bad4" xlink:to="loc_ce_TransferOfFinancialAssetsTreatedAsSalesNonRecourseOrLimitedRecourseBasisAccountsReceivablePercentage_019ddca2-9bcc-7d84-a7b7-f998a45f27b2" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/DebtScheduleofChinaCreditFacilitiesDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#DebtScheduleofChinaCreditFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/DebtScheduleofChinaCreditFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019dd9fb-d7de-7b97-abdf-3455449b9697" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019dd9fb-d7de-70d8-8158-ebd9ce278fd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019dd9fb-d7de-7b97-abdf-3455449b9697" xlink:to="loc_us-gaap_DebtInstrumentTable_019dd9fb-d7de-70d8-8158-ebd9ce278fd0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019dd9fb-d7de-7d6f-bfaf-81fa7f705b8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019dd9fb-d7de-70d8-8158-ebd9ce278fd0" xlink:to="loc_us-gaap_CreditFacilityAxis_019dd9fb-d7de-7d6f-bfaf-81fa7f705b8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019dd9fb-d7de-7d6f-bfaf-81fa7f705b8e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019dd9fb-d7de-7d6f-bfaf-81fa7f705b8e" xlink:to="loc_us-gaap_CreditFacilityDomain_019dd9fb-d7de-7d6f-bfaf-81fa7f705b8e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019dd9fb-d7de-76b4-ab14-b17bb9d02a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019dd9fb-d7de-7d6f-bfaf-81fa7f705b8e" xlink:to="loc_us-gaap_CreditFacilityDomain_019dd9fb-d7de-76b4-ab14-b17bb9d02a4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_ChinaCreditFacilitiesMember_019dd9fb-d7de-700d-b7ab-1421cd8e01de" xlink:href="ce-20260331.xsd#ce_ChinaCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019dd9fb-d7de-76b4-ab14-b17bb9d02a4e" xlink:to="loc_ce_ChinaCreditFacilitiesMember_019dd9fb-d7de-700d-b7ab-1421cd8e01de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_ChinaRevolvingCreditFacilitiesMember_019dda61-c282-71a5-ba7e-273dda408064" xlink:href="ce-20260331.xsd#ce_ChinaRevolvingCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019dd9fb-d7de-76b4-ab14-b17bb9d02a4e" xlink:to="loc_ce_ChinaRevolvingCreditFacilitiesMember_019dda61-c282-71a5-ba7e-273dda408064" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019dd9fb-d7de-781b-9d92-0e8c9706c8b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019dd9fb-d7de-70d8-8158-ebd9ce278fd0" xlink:to="loc_us-gaap_DebtInstrumentAxis_019dd9fb-d7de-781b-9d92-0e8c9706c8b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-781b-9d92-0e8c9706c8b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019dd9fb-d7de-781b-9d92-0e8c9706c8b6" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-781b-9d92-0e8c9706c8b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019dd9fb-d7de-781b-9d92-0e8c9706c8b6" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CSITRevolvingCreditAgreementMember_019dd9fb-d7de-7bfb-9c84-962ba8ffb0f7" xlink:href="ce-20260331.xsd#ce_CSITRevolvingCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:to="loc_ce_CSITRevolvingCreditAgreementMember_019dd9fb-d7de-7bfb-9c84-962ba8ffb0f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCWorkingCapitalLoanAgreementDueDecember252026Member_019dd9fb-d7de-7f44-81a3-32bdd772d2b5" xlink:href="ce-20260331.xsd#ce_CNCCWorkingCapitalLoanAgreementDueDecember252026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:to="loc_ce_CNCCWorkingCapitalLoanAgreementDueDecember252026Member_019dd9fb-d7de-7f44-81a3-32bdd772d2b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCWorkingCapitalLoanAgreementDueJune172027Member_019dd9fb-d7de-73ef-9ad5-9e4daa574e69" xlink:href="ce-20260331.xsd#ce_CNCCWorkingCapitalLoanAgreementDueJune172027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:to="loc_ce_CNCCWorkingCapitalLoanAgreementDueJune172027Member_019dd9fb-d7de-73ef-9ad5-9e4daa574e69" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCWorkingCapitalLoanAgreementDueJune282027Member_019dd9fb-d7de-79eb-a2e9-f68f279480f2" xlink:href="ce-20260331.xsd#ce_CNCCWorkingCapitalLoanAgreementDueJune282027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:to="loc_ce_CNCCWorkingCapitalLoanAgreementDueJune282027Member_019dd9fb-d7de-79eb-a2e9-f68f279480f2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCWorkingCapitalLoanAgreementDueDecember212027Member_019dd9fb-d7de-7292-a063-3aaaf81953ee" xlink:href="ce-20260331.xsd#ce_CNCCWorkingCapitalLoanAgreementDueDecember212027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:to="loc_ce_CNCCWorkingCapitalLoanAgreementDueDecember212027Member_019dd9fb-d7de-7292-a063-3aaaf81953ee" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCWorkingCapitalLoanAgreementDueMarch62028Member_019dd9fb-d7de-74e1-85b3-840807f66e1d" xlink:href="ce-20260331.xsd#ce_CNCCWorkingCapitalLoanAgreementDueMarch62028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:to="loc_ce_CNCCWorkingCapitalLoanAgreementDueMarch62028Member_019dd9fb-d7de-74e1-85b3-840807f66e1d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCWorkingCapitalLoanAgreementDueJune92028Member_019dd9fb-d7de-725f-80bd-d573cbe59249" xlink:href="ce-20260331.xsd#ce_CNCCWorkingCapitalLoanAgreementDueJune92028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:to="loc_ce_CNCCWorkingCapitalLoanAgreementDueJune92028Member_019dd9fb-d7de-725f-80bd-d573cbe59249" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCWorkingCapitalLoanAgreementDueJuly32028Member_019dd9fb-d7de-7861-b64b-9ad5f79e5b4f" xlink:href="ce-20260331.xsd#ce_CNCCWorkingCapitalLoanAgreementDueJuly32028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:to="loc_ce_CNCCWorkingCapitalLoanAgreementDueJuly32028Member_019dd9fb-d7de-7861-b64b-9ad5f79e5b4f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCWorkingCapitalLoanAgreementDueOctober202028Member_019dda0f-ddbf-738e-9425-0d4e5f18970d" xlink:href="ce-20260331.xsd#ce_CNCCWorkingCapitalLoanAgreementDueOctober202028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:to="loc_ce_CNCCWorkingCapitalLoanAgreementDueOctober202028Member_019dda0f-ddbf-738e-9425-0d4e5f18970d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCTermLoanAgreementDueMarch112031Member_019dda42-eb20-7273-a84e-5d7266b13f11" xlink:href="ce-20260331.xsd#ce_CNCCTermLoanAgreementDueMarch112031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:to="loc_ce_CNCCTermLoanAgreementDueMarch112031Member_019dda42-eb20-7273-a84e-5d7266b13f11" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCRevolvingCreditAgreementMember_019dda61-4e3a-746e-bff6-0df55aa8119c" xlink:href="ce-20260331.xsd#ce_CNCCRevolvingCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:to="loc_ce_CNCCRevolvingCreditAgreementMember_019dda61-4e3a-746e-bff6-0df55aa8119c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CNCCCNY950MTermLoanAgreementMember_019ddac8-c6c4-745a-865e-6d19702e1c08" xlink:href="ce-20260331.xsd#ce_CNCCCNY950MTermLoanAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dd9fb-d7de-7a09-bbdc-d8b9c8a1af34" xlink:to="loc_ce_CNCCCNY950MTermLoanAgreementMember_019ddac8-c6c4-745a-865e-6d19702e1c08" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019dd9fb-d7de-7897-a84b-110bcc4814ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019dd9fb-d7de-7b97-abdf-3455449b9697" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019dd9fb-d7de-7897-a84b-110bcc4814ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019dd9fb-d7de-7c0e-8172-be503700374e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019dd9fb-d7de-7b97-abdf-3455449b9697" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019dd9fb-d7de-7c0e-8172-be503700374e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LinesOfCreditCurrent_019dd9fb-d7de-7149-89d8-9ee68ab0b5c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LinesOfCreditCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019dd9fb-d7de-7b97-abdf-3455449b9697" xlink:to="loc_us-gaap_LinesOfCreditCurrent_019dd9fb-d7de-7149-89d8-9ee68ab0b5c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019dda64-12a2-79a2-8a2a-027bf1f3cc6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019dd9fb-d7de-7b97-abdf-3455449b9697" xlink:to="loc_us-gaap_DebtInstrumentTerm_019dda64-12a2-79a2-8a2a-027bf1f3cc6a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/DebtScheduleofRevolvingCreditFacilityDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#DebtScheduleofRevolvingCreditFacilityDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/DebtScheduleofRevolvingCreditFacilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_019c956f-4b85-7268-9803-6b2d67b28b97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_019c956f-4b85-7880-b1b3-9e5937ff5ca5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c956f-4b85-7268-9803-6b2d67b28b97" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_019c956f-4b85-7880-b1b3-9e5937ff5ca5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019c956f-4b85-7e2f-86c1-bc792f1c9739" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019c956f-4b85-7880-b1b3-9e5937ff5ca5" xlink:to="loc_us-gaap_CreditFacilityAxis_019c956f-4b85-7e2f-86c1-bc792f1c9739" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c956f-4b85-7e2f-86c1-bc792f1c9739_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019c956f-4b85-7e2f-86c1-bc792f1c9739" xlink:to="loc_us-gaap_CreditFacilityDomain_019c956f-4b85-7e2f-86c1-bc792f1c9739_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c956f-4b85-7dc7-b397-aa30f915f065" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019c956f-4b85-7e2f-86c1-bc792f1c9739" xlink:to="loc_us-gaap_CreditFacilityDomain_019c956f-4b85-7dc7-b397-aa30f915f065" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c956f-4b85-7a86-b636-40d2078db9e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019c956f-4b85-7dc7-b397-aa30f915f065" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c956f-4b85-7a86-b636-40d2078db9e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_ChinaRevolvingCreditFacilitiesMember_019c956f-4b85-7c7a-a094-d9725c2c7f4f" xlink:href="ce-20260331.xsd#ce_ChinaRevolvingCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019c956f-4b85-7dc7-b397-aa30f915f065" xlink:to="loc_ce_ChinaRevolvingCreditFacilitiesMember_019c956f-4b85-7c7a-a094-d9725c2c7f4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c956f-4b85-7d3e-a38d-e0dd0374447e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019c956f-4b85-7880-b1b3-9e5937ff5ca5" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c956f-4b85-7d3e-a38d-e0dd0374447e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4b85-7d3e-a38d-e0dd0374447e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c956f-4b85-7d3e-a38d-e0dd0374447e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4b85-7d3e-a38d-e0dd0374447e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4b85-77d8-a8eb-1ba6a3cef264" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c956f-4b85-7d3e-a38d-e0dd0374447e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4b85-77d8-a8eb-1ba6a3cef264" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c956f-4b85-7091-95b2-355670eb90cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4b85-77d8-a8eb-1ba6a3cef264" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c956f-4b85-7091-95b2-355670eb90cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_ChinaRevolvingCreditFacilitiesMember_019c956f-4b85-7d30-8c5a-006b884e96f9" xlink:href="ce-20260331.xsd#ce_ChinaRevolvingCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4b85-77d8-a8eb-1ba6a3cef264" xlink:to="loc_ce_ChinaRevolvingCreditFacilitiesMember_019c956f-4b85-7d30-8c5a-006b884e96f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LinesOfCreditCurrent_019c956f-4b85-7c92-89cb-435316e6fb04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LinesOfCreditCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c956f-4b85-7268-9803-6b2d67b28b97" xlink:to="loc_us-gaap_LinesOfCreditCurrent_019c956f-4b85-7c92-89cb-435316e6fb04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019c956f-4b85-739f-b36e-45ae8c0eb26c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c956f-4b85-7268-9803-6b2d67b28b97" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019c956f-4b85-739f-b36e-45ae8c0eb26c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/BenefitObligationsScheduleofNetPeriodicBenefitCostsRecognizedDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#BenefitObligationsScheduleofNetPeriodicBenefitCostsRecognizedDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/BenefitObligationsScheduleofNetPeriodicBenefitCostsRecognizedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-7abd-9a6d-4d2637940d5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019c956f-4b85-763f-a922-9494db4a62df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-7abd-9a6d-4d2637940d5e" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019c956f-4b85-763f-a922-9494db4a62df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019c956f-4b85-77b1-932f-3ca6c42ae74d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019c956f-4b85-763f-a922-9494db4a62df" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019c956f-4b85-77b1-932f-3ca6c42ae74d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-77b1-932f-3ca6c42ae74d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019c956f-4b85-77b1-932f-3ca6c42ae74d" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-77b1-932f-3ca6c42ae74d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7a4a-8282-7ec14c76cf9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019c956f-4b85-77b1-932f-3ca6c42ae74d" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7a4a-8282-7ec14c76cf9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019c956f-4b85-7edb-8b6a-45992a2d7246" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7a4a-8282-7ec14c76cf9e" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019c956f-4b85-7edb-8b6a-45992a2d7246" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019c956f-4b85-7f27-b691-f35639412a51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7a4a-8282-7ec14c76cf9e" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019c956f-4b85-7f27-b691-f35639412a51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_019c956f-4b85-7102-aad3-d7f86161c42f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-7abd-9a6d-4d2637940d5e" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_019c956f-4b85-7102-aad3-d7f86161c42f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_019c956f-4b85-7c5e-af31-834eebd48b52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-7abd-9a6d-4d2637940d5e" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_019c956f-4b85-7c5e-af31-834eebd48b52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_019c956f-4b85-7262-9a4a-6b2deec9a419" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-7abd-9a6d-4d2637940d5e" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_019c956f-4b85-7262-9a4a-6b2deec9a419" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_019c956f-4b85-7517-9872-6bd94494213d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-7abd-9a6d-4d2637940d5e" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_019c956f-4b85-7517-9872-6bd94494213d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/BenefitObligationsScheduleofCompanyCommitmentstoFundBenefitObligationsDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#BenefitObligationsScheduleofCompanyCommitmentstoFundBenefitObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/BenefitObligationsScheduleofCompanyCommitmentstoFundBenefitObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-721e-b677-f84a6ea76fc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019c956f-4b85-732f-bc1f-104606399636" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-721e-b677-f84a6ea76fc4" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019c956f-4b85-732f-bc1f-104606399636" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019c956f-4b85-7e4a-9ea8-dccbd181e4b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019c956f-4b85-732f-bc1f-104606399636" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019c956f-4b85-7e4a-9ea8-dccbd181e4b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7e4a-9ea8-dccbd181e4b4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019c956f-4b85-7e4a-9ea8-dccbd181e4b4" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7e4a-9ea8-dccbd181e4b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7192-9cb9-9d6f5519b36b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019c956f-4b85-7e4a-9ea8-dccbd181e4b4" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7192-9cb9-9d6f5519b36b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019c956f-4b85-74cc-b165-22bf3adaa0ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7192-9cb9-9d6f5519b36b" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019c956f-4b85-74cc-b165-22bf3adaa0ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_019c956f-4b85-7baf-8e45-5a9e691a8a59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7192-9cb9-9d6f5519b36b" xlink:to="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_019c956f-4b85-7baf-8e45-5a9e691a8a59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019c956f-4b85-7268-ac7a-fc8f38a70287" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7192-9cb9-9d6f5519b36b" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019c956f-4b85-7268-ac7a-fc8f38a70287" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_019c956f-4b85-7694-a4a2-e39f0ce74137" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-721e-b677-f84a6ea76fc4" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_019c956f-4b85-7694-a4a2-e39f0ce74137" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsCurrentFiscalYear_019c956f-4b85-7311-b96d-eab58f3d3f27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-721e-b677-f84a6ea76fc4" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsCurrentFiscalYear_019c956f-4b85-7311-b96d-eab58f3d3f27" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/BenefitObligationsScheduleofDefinedBenefitPlansDisclosuresDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#BenefitObligationsScheduleofDefinedBenefitPlansDisclosuresDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/BenefitObligationsScheduleofDefinedBenefitPlansDisclosuresDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-79df-b682-d37575722495" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019c956f-4b85-7afd-871a-4a91fc56e4ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-79df-b682-d37575722495" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019c956f-4b85-7afd-871a-4a91fc56e4ee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019c956f-4b85-7646-b98b-0dd9dc7bb407" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019c956f-4b85-7afd-871a-4a91fc56e4ee" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019c956f-4b85-7646-b98b-0dd9dc7bb407" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7646-b98b-0dd9dc7bb407_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019c956f-4b85-7646-b98b-0dd9dc7bb407" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7646-b98b-0dd9dc7bb407_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7fac-ac36-37fcefcb0b2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019c956f-4b85-7646-b98b-0dd9dc7bb407" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7fac-ac36-37fcefcb0b2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019c956f-4b85-7485-8b09-e5b48b2140bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7fac-ac36-37fcefcb0b2c" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019c956f-4b85-7485-8b09-e5b48b2140bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019c956f-4b85-7faa-9a9a-5b610708e632" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019c956f-4b85-7fac-ac36-37fcefcb0b2c" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019c956f-4b85-7faa-9a9a-5b610708e632" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_019c956f-4b85-73c9-befa-41a934fea10a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-79df-b682-d37575722495" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_019c956f-4b85-73c9-befa-41a934fea10a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_019c956f-4b85-70ff-8681-3c1d8d9e4c68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-79df-b682-d37575722495" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_019c956f-4b85-70ff-8681-3c1d8d9e4c68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_019c956f-4b85-7c8d-995b-ed3ab0f685cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-79df-b682-d37575722495" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_019c956f-4b85-7c8d-995b-ed3ab0f685cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_019c956f-4b85-7e5a-ab03-04154e1c30aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019c956f-4b85-79df-b682-d37575722495" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_019c956f-4b85-7e5a-ab03-04154e1c30aa" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/EnvironmentalUSSuperfundSitesNarrativeDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#EnvironmentalUSSuperfundSitesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/EnvironmentalUSSuperfundSitesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SiteContingencyLineItems_019c956f-4b85-7e4f-871b-9f6fa2d12205" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SiteContingencyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SiteContingencyTable_019c956f-4b85-7abb-b760-c9ed65b3a024" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SiteContingencyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SiteContingencyLineItems_019c956f-4b85-7e4f-871b-9f6fa2d12205" xlink:to="loc_us-gaap_SiteContingencyTable_019c956f-4b85-7abb-b760-c9ed65b3a024" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteAxis_019c956f-4b85-7a73-b535-de564f8e89b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EnvironmentalRemediationSiteAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SiteContingencyTable_019c956f-4b85-7abb-b760-c9ed65b3a024" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteAxis_019c956f-4b85-7a73-b535-de564f8e89b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteDomain_019c956f-4b85-7a73-b535-de564f8e89b3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EnvironmentalRemediationSiteDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteAxis_019c956f-4b85-7a73-b535-de564f8e89b3" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteDomain_019c956f-4b85-7a73-b535-de564f8e89b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteDomain_019c956f-4b85-741d-a6a4-844dd859aa24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EnvironmentalRemediationSiteDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteAxis_019c956f-4b85-7a73-b535-de564f8e89b3" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteDomain_019c956f-4b85-741d-a6a4-844dd859aa24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_PassaicRiverNewJerseyMember_019c956f-4b85-7f09-bd40-ae2a356eb0e8" xlink:href="ce-20260331.xsd#ce_PassaicRiverNewJerseyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_019c956f-4b85-741d-a6a4-844dd859aa24" xlink:to="loc_ce_PassaicRiverNewJerseyMember_019c956f-4b85-7f09-bd40-ae2a356eb0e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_NumberOfPartiesIncludedInUsepaOrder_019c956f-4b85-7072-8bb9-0c565d5e9704" xlink:href="ce-20260331.xsd#ce_NumberOfPartiesIncludedInUsepaOrder"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_019c956f-4b85-7e4f-871b-9f6fa2d12205" xlink:to="loc_ce_NumberOfPartiesIncludedInUsepaOrder_019c956f-4b85-7072-8bb9-0c565d5e9704" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_Environmental_019c956f-4b85-7296-ad30-c90c0659eaee" xlink:href="ce-20260331.xsd#ce_Environmental"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_019c956f-4b85-7e4f-871b-9f6fa2d12205" xlink:to="loc_ce_Environmental_019c956f-4b85-7296-ad30-c90c0659eaee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EnvironmentalLiabilityPercentage_019c956f-4b85-788b-b570-92438743cbe2" xlink:href="ce-20260331.xsd#ce_EnvironmentalLiabilityPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_019c956f-4b85-7e4f-871b-9f6fa2d12205" xlink:to="loc_ce_EnvironmentalLiabilityPercentage_019c956f-4b85-788b-b570-92438743cbe2" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/StockholdersEquityNarrativeDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#StockholdersEquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/StockholdersEquityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_019c956f-4b85-7ae8-8d10-36491193d796" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_019c956f-4b85-759e-af49-be85194189df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c956f-4b85-7ae8-8d10-36491193d796" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_019c956f-4b85-759e-af49-be85194189df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019c956f-4b85-75da-acce-9025e55e5022" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019c956f-4b85-759e-af49-be85194189df" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019c956f-4b85-75da-acce-9025e55e5022" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019c956f-4b85-75da-acce-9025e55e5022_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019c956f-4b85-75da-acce-9025e55e5022" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019c956f-4b85-75da-acce-9025e55e5022_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019c956f-4b85-7bd4-a0f1-a0d772fa59b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019c956f-4b85-75da-acce-9025e55e5022" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019c956f-4b85-7bd4-a0f1-a0d772fa59b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019c956f-4b85-7682-a678-0bcfc852d846" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019c956f-4b85-7bd4-a0f1-a0d772fa59b5" xlink:to="loc_us-gaap_SubsequentEventMember_019c956f-4b85-7682-a678-0bcfc852d846" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019c956f-4b85-7875-8112-8df67477aad9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c956f-4b85-7ae8-8d10-36491193d796" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019c956f-4b85-7875-8112-8df67477aad9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_CommonStockDividendsDecreasePercentage_019c956f-4b85-786a-b369-8804aca336e2" xlink:href="ce-20260331.xsd#ce_CommonStockDividendsDecreasePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c956f-4b85-7ae8-8d10-36491193d796" xlink:to="loc_ce_CommonStockDividendsDecreasePercentage_019c956f-4b85-786a-b369-8804aca336e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_019c956f-4b85-7e19-be33-0aed5916e348" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c956f-4b85-7ae8-8d10-36491193d796" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_019c956f-4b85-7e19-be33-0aed5916e348" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_019c956f-4b85-704a-ad34-04d1823ef515" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c956f-4b85-7ae8-8d10-36491193d796" xlink:to="loc_us-gaap_DividendsCommonStockCash_019c956f-4b85-704a-ad34-04d1823ef515" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/StockholdersEquityScheduleofAdjustmentstoAccumulatedOtherComprehensiveIncomeLossNetDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#StockholdersEquityScheduleofAdjustmentstoAccumulatedOtherComprehensiveIncomeLossNetDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/StockholdersEquityScheduleofAdjustmentstoAccumulatedOtherComprehensiveIncomeLossNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c956f-4c36-71e4-850c-23cfb26ebaaf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c956f-4c36-77e6-808c-19ee14603959" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c956f-4c36-71e4-850c-23cfb26ebaaf" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c956f-4c36-77e6-808c-19ee14603959" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c956f-4c36-7c46-823d-dad06bfa0487" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c956f-4c36-77e6-808c-19ee14603959" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c956f-4c36-7c46-823d-dad06bfa0487" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c956f-4c36-7c46-823d-dad06bfa0487_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c956f-4c36-7c46-823d-dad06bfa0487" xlink:to="loc_us-gaap_EquityComponentDomain_019c956f-4c36-7c46-823d-dad06bfa0487_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c956f-4c36-7bfd-9959-fe101a25dc90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c956f-4c36-7c46-823d-dad06bfa0487" xlink:to="loc_us-gaap_EquityComponentDomain_019c956f-4c36-7bfd-9959-fe101a25dc90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c956f-4c36-7423-966d-2df865913aa6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c956f-4c36-7bfd-9959-fe101a25dc90" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c956f-4c36-7423-966d-2df865913aa6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentParentMember_019c956f-4c36-7484-ba7f-28b8ef1e5871" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c956f-4c36-7bfd-9959-fe101a25dc90" xlink:to="loc_us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentParentMember_019c956f-4c36-7484-ba7f-28b8ef1e5871" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019c956f-4c36-749b-b1e2-4db52796e85f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c956f-4c36-7bfd-9959-fe101a25dc90" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019c956f-4c36-749b-b1e2-4db52796e85f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c956f-4c36-71ff-9818-0ad1229adc32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c956f-4c36-7bfd-9959-fe101a25dc90" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c956f-4c36-71ff-9818-0ad1229adc32" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c956f-4c36-7dca-95ed-5279b66c6916" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c956f-4c36-71e4-850c-23cfb26ebaaf" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c956f-4c36-7dca-95ed-5279b66c6916" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019c956f-4c36-79e9-8401-a190e6b3528c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c956f-4c36-71e4-850c-23cfb26ebaaf" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019c956f-4c36-79e9-8401-a190e6b3528c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_019c956f-4c36-7ead-befe-5962d4bdce35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c956f-4c36-71e4-850c-23cfb26ebaaf" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_019c956f-4c36-7ead-befe-5962d4bdce35" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_019c956f-4c36-7d57-bffb-246f9025295f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c956f-4c36-71e4-850c-23cfb26ebaaf" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_019c956f-4c36-7d57-bffb-246f9025295f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c956f-4c36-7c61-b662-08dff043de0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/DerivativeFinancialInstrumentsScheduleofChangesinFairValueofDerivativesDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#DerivativeFinancialInstrumentsScheduleofChangesinFairValueofDerivativesDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/DerivativeFinancialInstrumentsScheduleofChangesinFairValueofDerivativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019c956f-4c36-7da5-a8ce-fd6bfb559446" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019c956f-4c36-7885-996f-6690aca41e8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019c956f-4c36-7da5-a8ce-fd6bfb559446" xlink:to="loc_us-gaap_DerivativeTable_019c956f-4c36-7885-996f-6690aca41e8d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c956f-4c36-7ab1-97f4-0d5174ded12e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019c956f-4c36-7885-996f-6690aca41e8d" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c956f-4c36-7ab1-97f4-0d5174ded12e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4c36-7ab1-97f4-0d5174ded12e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c956f-4c36-7ab1-97f4-0d5174ded12e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4c36-7ab1-97f4-0d5174ded12e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4c36-7e6e-a55b-03fcbc100e8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c956f-4c36-7ab1-97f4-0d5174ded12e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4c36-7e6e-a55b-03fcbc100e8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_ForeignCurrencyDenominatedDebtMember_019c956f-4c36-7dd9-bb7c-8ded6d6a29a7" xlink:href="ce-20260331.xsd#ce_ForeignCurrencyDenominatedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4c36-7e6e-a55b-03fcbc100e8d" xlink:to="loc_ce_ForeignCurrencyDenominatedDebtMember_019c956f-4c36-7dd9-bb7c-8ded6d6a29a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_JPYDenominatedBorrowingsMember_019c956f-4c36-7806-b43e-2b4d670b9ac5" xlink:href="ce-20260331.xsd#ce_JPYDenominatedBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4c36-7e6e-a55b-03fcbc100e8d" xlink:to="loc_ce_JPYDenominatedBorrowingsMember_019c956f-4c36-7806-b43e-2b4d670b9ac5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_USDSeniorUnsecuredNotesDue2033Member_019c956f-4c36-7248-be1c-f92d1d97791c" xlink:href="ce-20260331.xsd#ce_USDSeniorUnsecuredNotesDue2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c956f-4c36-7e6e-a55b-03fcbc100e8d" xlink:to="loc_ce_USDSeniorUnsecuredNotesDue2033Member_019c956f-4c36-7248-be1c-f92d1d97791c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c956f-4c36-7aa1-bea8-e8368d9685c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019c956f-4c36-7885-996f-6690aca41e8d" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c956f-4c36-7aa1-bea8-e8368d9685c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-7aa1-bea8-e8368d9685c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c956f-4c36-7aa1-bea8-e8368d9685c5" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-7aa1-bea8-e8368d9685c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-70b4-a086-06390f20e60e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c956f-4c36-7aa1-bea8-e8368d9685c5" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-70b4-a086-06390f20e60e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019c956f-4c36-7f10-aa38-0aa48ebf122e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-70b4-a086-06390f20e60e" xlink:to="loc_us-gaap_CashFlowHedgingMember_019c956f-4c36-7f10-aa38-0aa48ebf122e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019c956f-4c36-7eb8-ba5c-b1c7af08c2b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-70b4-a086-06390f20e60e" xlink:to="loc_us-gaap_FairValueHedgingMember_019c956f-4c36-7eb8-ba5c-b1c7af08c2b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_019c956f-4c36-781c-8d99-9c907e560ace" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetInvestmentHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-70b4-a086-06390f20e60e" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_019c956f-4c36-781c-8d99-9c907e560ace" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c956f-4c36-78b6-a134-efe880a8f66c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019c956f-4c36-7885-996f-6690aca41e8d" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c956f-4c36-78b6-a134-efe880a8f66c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-78b6-a134-efe880a8f66c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c956f-4c36-78b6-a134-efe880a8f66c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-78b6-a134-efe880a8f66c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-7d63-ae11-fcced0b954b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c956f-4c36-78b6-a134-efe880a8f66c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-7d63-ae11-fcced0b954b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_019c956f-4c36-7fee-8235-fd0dc98c77c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-7d63-ae11-fcced0b954b3" xlink:to="loc_us-gaap_CommodityContractMember_019c956f-4c36-7fee-8235-fd0dc98c77c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019c956f-4c36-7ca8-83a4-5dd6d35c6dbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-7d63-ae11-fcced0b954b3" xlink:to="loc_us-gaap_InterestRateSwapMember_019c956f-4c36-7ca8-83a4-5dd6d35c6dbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019c956f-4c36-73ca-9bee-5ef3ebbd4f45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-7d63-ae11-fcced0b954b3" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019c956f-4c36-73ca-9bee-5ef3ebbd4f45" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019c956f-4c36-7787-b8ac-784d9dcfaa14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-7d63-ae11-fcced0b954b3" xlink:to="loc_us-gaap_CurrencySwapMember_019c956f-4c36-7787-b8ac-784d9dcfaa14" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019c956f-4c36-74e2-b989-a5b5e9208c70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019c956f-4c36-7885-996f-6690aca41e8d" xlink:to="loc_us-gaap_HedgingDesignationAxis_019c956f-4c36-74e2-b989-a5b5e9208c70" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019c956f-4c36-74e2-b989-a5b5e9208c70_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019c956f-4c36-74e2-b989-a5b5e9208c70" xlink:to="loc_us-gaap_HedgingDesignationDomain_019c956f-4c36-74e2-b989-a5b5e9208c70_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019c956f-4c36-7361-8152-2555e6962681" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019c956f-4c36-74e2-b989-a5b5e9208c70" xlink:to="loc_us-gaap_HedgingDesignationDomain_019c956f-4c36-7361-8152-2555e6962681" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019c956f-4c36-7a1e-acbe-c6666c42c1cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019c956f-4c36-7361-8152-2555e6962681" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019c956f-4c36-7a1e-acbe-c6666c42c1cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019c956f-4c36-7076-bdd0-b87b6ac40ce5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019c956f-4c36-7361-8152-2555e6962681" xlink:to="loc_us-gaap_NondesignatedMember_019c956f-4c36-7076-bdd0-b87b6ac40ce5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019c956f-4c36-72ca-a06a-9eaaa50766f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019c956f-4c36-7da5-a8ce-fd6bfb559446" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019c956f-4c36-72ca-a06a-9eaaa50766f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseBeforeAdjustmentsAndTax_019c956f-4c36-7059-b710-3d7ddfd23222" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseBeforeAdjustmentsAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019c956f-4c36-7da5-a8ce-fd6bfb559446" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseBeforeAdjustmentsAndTax_019c956f-4c36-7059-b710-3d7ddfd23222" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_GainLossOnNonDerivativeUsedInNetInvestmentHedge_019c956f-4c36-796d-8936-9d7667e45e24" xlink:href="ce-20260331.xsd#ce_GainLossOnNonDerivativeUsedInNetInvestmentHedge"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019c956f-4c36-7da5-a8ce-fd6bfb559446" xlink:to="loc_ce_GainLossOnNonDerivativeUsedInNetInvestmentHedge_019c956f-4c36-796d-8936-9d7667e45e24" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax_019c956f-4c36-7f0f-a291-032394f89d6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019c956f-4c36-7da5-a8ce-fd6bfb559446" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax_019c956f-4c36-7f0f-a291-032394f89d6d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_GainLossOnNonDerivativesandDerivativesUsedInNetInvestmentHedge_019c956f-4c36-77b1-b624-1f211c69cb4c" xlink:href="ce-20260331.xsd#ce_GainLossOnNonDerivativesandDerivativesUsedInNetInvestmentHedge"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019c956f-4c36-7da5-a8ce-fd6bfb559446" xlink:to="loc_ce_GainLossOnNonDerivativesandDerivativesUsedInNetInvestmentHedge_019c956f-4c36-77b1-b624-1f211c69cb4c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019c956f-4c36-712c-9151-75f40b4d6610" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019c956f-4c36-7da5-a8ce-fd6bfb559446" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019c956f-4c36-712c-9151-75f40b4d6610" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019c956f-4c36-79e2-9f8d-59dd2b2fb30a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019c956f-4c36-7da5-a8ce-fd6bfb559446" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019c956f-4c36-79e2-9f8d-59dd2b2fb30a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_019ddcb2-df4b-7485-971d-a4164314a4c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019c956f-4c36-7da5-a8ce-fd6bfb559446" xlink:to="loc_us-gaap_DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_019ddcb2-df4b-7485-971d-a4164314a4c6" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/FairValueMeasurementsScheduleofAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#FairValueMeasurementsScheduleofAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/FairValueMeasurementsScheduleofAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c956f-4c36-7757-825d-d13d94e37db0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c956f-4c36-7a05-bed2-bf3d19f21225" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c956f-4c36-7757-825d-d13d94e37db0" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c956f-4c36-7a05-bed2-bf3d19f21225" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c956f-4c36-7d8f-8966-2b9ca39c7682" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c956f-4c36-7a05-bed2-bf3d19f21225" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c956f-4c36-7d8f-8966-2b9ca39c7682" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-7d8f-8966-2b9ca39c7682_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c956f-4c36-7d8f-8966-2b9ca39c7682" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-7d8f-8966-2b9ca39c7682_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-770b-99c2-acab3c2b132e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c956f-4c36-7d8f-8966-2b9ca39c7682" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-770b-99c2-acab3c2b132e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_019c956f-4c36-7f49-aca6-08753f0e6713" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-770b-99c2-acab3c2b132e" xlink:to="loc_us-gaap_CommodityContractMember_019c956f-4c36-7f49-aca6-08753f0e6713" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019c956f-4c36-7293-a50e-4686b971380c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-770b-99c2-acab3c2b132e" xlink:to="loc_us-gaap_CurrencySwapMember_019c956f-4c36-7293-a50e-4686b971380c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019c956f-4c36-762d-9cfe-fffd5a592f8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c956f-4c36-770b-99c2-acab3c2b132e" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019c956f-4c36-762d-9cfe-fffd5a592f8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c956f-4c36-75c2-88cd-be9ed8dbccdc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c956f-4c36-7a05-bed2-bf3d19f21225" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c956f-4c36-75c2-88cd-be9ed8dbccdc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-75c2-88cd-be9ed8dbccdc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c956f-4c36-75c2-88cd-be9ed8dbccdc" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-75c2-88cd-be9ed8dbccdc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-7fbd-90ea-d62089454ae8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c956f-4c36-75c2-88cd-be9ed8dbccdc" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-7fbd-90ea-d62089454ae8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019c956f-4c36-7c44-bf05-f853afe4254c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-7fbd-90ea-d62089454ae8" xlink:to="loc_us-gaap_CashFlowHedgingMember_019c956f-4c36-7c44-bf05-f853afe4254c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019c956f-4c36-748d-bc28-265906c4cab9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-7fbd-90ea-d62089454ae8" xlink:to="loc_us-gaap_FairValueHedgingMember_019c956f-4c36-748d-bc28-265906c4cab9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_019c956f-4c36-798c-954b-a595f727b134" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetInvestmentHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019c956f-4c36-7fbd-90ea-d62089454ae8" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_019c956f-4c36-798c-954b-a595f727b134" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_019c956f-4c36-710b-9359-c89a1e86dee2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c956f-4c36-7a05-bed2-bf3d19f21225" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_019c956f-4c36-710b-9359-c89a1e86dee2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019c956f-4c36-710b-9359-c89a1e86dee2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019c956f-4c36-710b-9359-c89a1e86dee2" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019c956f-4c36-710b-9359-c89a1e86dee2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019c956f-4c36-7ffb-95ac-e500312ae022" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019c956f-4c36-710b-9359-c89a1e86dee2" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019c956f-4c36-7ffb-95ac-e500312ae022" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_019c956f-4c36-7d9e-82e2-a3a6e41aa86a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019c956f-4c36-7ffb-95ac-e500312ae022" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_019c956f-4c36-7d9e-82e2-a3a6e41aa86a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_019c956f-4c36-7af7-b5df-f9ed643842a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019c956f-4c36-7ffb-95ac-e500312ae022" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_019c956f-4c36-7af7-b5df-f9ed643842a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_019c956f-4c36-7a9d-aef7-40fcddd93d84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019c956f-4c36-7ffb-95ac-e500312ae022" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_019c956f-4c36-7a9d-aef7-40fcddd93d84" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_019c956f-4c36-7e98-84c1-c60831928ca6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019c956f-4c36-7ffb-95ac-e500312ae022" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_019c956f-4c36-7e98-84c1-c60831928ca6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c956f-4c36-746d-b358-746205634c1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c956f-4c36-7a05-bed2-bf3d19f21225" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c956f-4c36-746d-b358-746205634c1b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c956f-4c36-746d-b358-746205634c1b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c956f-4c36-746d-b358-746205634c1b" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c956f-4c36-746d-b358-746205634c1b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c956f-4c36-7f52-b290-1bd3d67bcc92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c956f-4c36-746d-b358-746205634c1b" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c956f-4c36-7f52-b290-1bd3d67bcc92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019c956f-4c36-737a-b831-2fa2dd745d00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c956f-4c36-7f52-b290-1bd3d67bcc92" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019c956f-4c36-737a-b831-2fa2dd745d00" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019c956f-4c36-7626-9770-7f9bc13fc013" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c956f-4c36-7a05-bed2-bf3d19f21225" xlink:to="loc_us-gaap_HedgingDesignationAxis_019c956f-4c36-7626-9770-7f9bc13fc013" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019c956f-4c36-7626-9770-7f9bc13fc013_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019c956f-4c36-7626-9770-7f9bc13fc013" xlink:to="loc_us-gaap_HedgingDesignationDomain_019c956f-4c36-7626-9770-7f9bc13fc013_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019c956f-4c36-7e28-bd89-5859dc1470a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019c956f-4c36-7626-9770-7f9bc13fc013" xlink:to="loc_us-gaap_HedgingDesignationDomain_019c956f-4c36-7e28-bd89-5859dc1470a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019c956f-4c36-79b4-a074-6c7d1e33ec7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019c956f-4c36-7e28-bd89-5859dc1470a6" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019c956f-4c36-79b4-a074-6c7d1e33ec7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019c956f-4c36-7d33-a3b4-eb36393baed1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019c956f-4c36-7e28-bd89-5859dc1470a6" xlink:to="loc_us-gaap_NondesignatedMember_019c956f-4c36-7d33-a3b4-eb36393baed1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c956f-4c36-7713-9cde-4c8e86f048d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c956f-4c36-7a05-bed2-bf3d19f21225" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c956f-4c36-7713-9cde-4c8e86f048d2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c956f-4c36-7713-9cde-4c8e86f048d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c956f-4c36-7713-9cde-4c8e86f048d2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c956f-4c36-7713-9cde-4c8e86f048d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c956f-4c36-71b6-ba51-2d99a5e672a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c956f-4c36-7713-9cde-4c8e86f048d2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c956f-4c36-71b6-ba51-2d99a5e672a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019c956f-4c36-7c98-9c13-7cba1d525259" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c956f-4c36-71b6-ba51-2d99a5e672a1" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019c956f-4c36-7c98-9c13-7cba1d525259" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis_019c956f-4c36-79c9-82d3-dbbd4461bb8b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CurrencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c956f-4c36-7a05-bed2-bf3d19f21225" xlink:to="loc_srt_CurrencyAxis_019c956f-4c36-79c9-82d3-dbbd4461bb8b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019c956f-4c36-79c9-82d3-dbbd4461bb8b_default" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CurrencyAxis_019c956f-4c36-79c9-82d3-dbbd4461bb8b" xlink:to="loc_currency_AllCurrenciesDomain_019c956f-4c36-79c9-82d3-dbbd4461bb8b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019c956f-4c36-74a3-b673-f4dd16c06d1a" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CurrencyAxis_019c956f-4c36-79c9-82d3-dbbd4461bb8b" xlink:to="loc_currency_AllCurrenciesDomain_019c956f-4c36-74a3-b673-f4dd16c06d1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_EUR_019c956f-4c36-71ca-ba7c-192b2e2e74ff" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_EUR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_019c956f-4c36-74a3-b673-f4dd16c06d1a" xlink:to="loc_currency_EUR_019c956f-4c36-71ca-ba7c-192b2e2e74ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_CNY_019c956f-4c36-7f7d-b41a-2c5a8378993c" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_CNY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_019c956f-4c36-74a3-b673-f4dd16c06d1a" xlink:to="loc_currency_CNY_019c956f-4c36-7f7d-b41a-2c5a8378993c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_JPY_019c956f-4c36-76b4-b65c-6c45a7c09fab" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_JPY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_019c956f-4c36-74a3-b673-f4dd16c06d1a" xlink:to="loc_currency_JPY_019c956f-4c36-76b4-b65c-6c45a7c09fab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019c956f-4c36-7750-b051-56607311a595" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c956f-4c36-7757-825d-d13d94e37db0" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019c956f-4c36-7750-b051-56607311a595" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019c956f-4c36-762c-8151-2c69ce44acd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c956f-4c36-7757-825d-d13d94e37db0" xlink:to="loc_us-gaap_DerivativeAssets_019c956f-4c36-762c-8151-2c69ce44acd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_019c956f-4c36-7176-98fe-a39705af8850" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c956f-4c36-7757-825d-d13d94e37db0" xlink:to="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_019c956f-4c36-7176-98fe-a39705af8850" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019c956f-4c36-77a7-8950-fef5b72273cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c956f-4c36-7757-825d-d13d94e37db0" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019c956f-4c36-77a7-8950-fef5b72273cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019c956f-4c36-714c-b45e-1ccd58bee083" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c956f-4c36-7757-825d-d13d94e37db0" xlink:to="loc_us-gaap_DerivativeLiabilities_019c956f-4c36-714c-b45e-1ccd58bee083" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_019c956f-4c36-7d30-9b2e-ef293abc149c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c956f-4c36-7757-825d-d13d94e37db0" xlink:to="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_019c956f-4c36-7d30-9b2e-ef293abc149c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019c956f-4c36-72d6-9df2-15640b033da2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c956f-4c36-7757-825d-d13d94e37db0" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019c956f-4c36-72d6-9df2-15640b033da2" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/FairValueMeasurementsScheduleofCarryingValuesandFairValuesofFinancialInstrumentsDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#FairValueMeasurementsScheduleofCarryingValuesandFairValuesofFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/FairValueMeasurementsScheduleofCarryingValuesandFairValuesofFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019c956f-4c36-70a5-ac5e-80f6331b0747" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019c956f-4c36-7ebc-a33f-55022a256c40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019c956f-4c36-70a5-ac5e-80f6331b0747" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019c956f-4c36-7ebc-a33f-55022a256c40" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c956f-4c36-747b-8cee-31e2a5fd0b68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019c956f-4c36-7ebc-a33f-55022a256c40" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c956f-4c36-747b-8cee-31e2a5fd0b68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c956f-4c36-747b-8cee-31e2a5fd0b68_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c956f-4c36-747b-8cee-31e2a5fd0b68" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c956f-4c36-747b-8cee-31e2a5fd0b68_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c956f-4c36-72f9-a01d-acdb0a90d840" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c956f-4c36-747b-8cee-31e2a5fd0b68" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c956f-4c36-72f9-a01d-acdb0a90d840" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019c956f-4c36-7827-9087-cf14872a2314" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c956f-4c36-72f9-a01d-acdb0a90d840" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019c956f-4c36-7827-9087-cf14872a2314" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019c956f-4c36-7c74-bb9e-4ac0cb6620af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c956f-4c36-72f9-a01d-acdb0a90d840" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019c956f-4c36-7c74-bb9e-4ac0cb6620af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount_019c956f-4c36-7f8b-bd1c-221463fe8237" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019c956f-4c36-70a5-ac5e-80f6331b0747" xlink:to="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount_019c956f-4c36-7f8b-bd1c-221463fe8237" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue_019c956f-4c36-7488-9798-ed59c1737fb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019c956f-4c36-70a5-ac5e-80f6331b0747" xlink:to="loc_us-gaap_EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue_019c956f-4c36-7488-9798-ed59c1737fb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashSurrenderValueOfLifeInsurance_019c956f-4c36-7d86-b55f-46a137e5cfb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashSurrenderValueOfLifeInsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019c956f-4c36-70a5-ac5e-80f6331b0747" xlink:to="loc_us-gaap_CashSurrenderValueOfLifeInsurance_019c956f-4c36-7d86-b55f-46a137e5cfb4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashSurrenderValueFairValueDisclosure_019c956f-4c36-7186-88bd-73b8c95f8f7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashSurrenderValueFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019c956f-4c36-70a5-ac5e-80f6331b0747" xlink:to="loc_us-gaap_CashSurrenderValueFairValueDisclosure_019c956f-4c36-7186-88bd-73b8c95f8f7a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019c956f-4c36-76cc-be4b-04ab16206cdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019c956f-4c36-70a5-ac5e-80f6331b0747" xlink:to="loc_us-gaap_LongTermDebt_019c956f-4c36-76cc-be4b-04ab16206cdd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019c956f-4c36-7d88-a8f2-6843596d0e88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019c956f-4c36-70a5-ac5e-80f6331b0747" xlink:to="loc_us-gaap_LongTermDebtFairValue_019c956f-4c36-7d88-a8f2-6843596d0e88" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019c956f-4c36-73c8-a05e-e9327c15406b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019c956f-4c36-70d1-a91f-3d7fbafe6cc5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c956f-4c36-73c8-a05e-e9327c15406b" xlink:to="loc_us-gaap_LossContingenciesTable_019c956f-4c36-70d1-a91f-3d7fbafe6cc5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019c956f-4c36-70d0-a40c-d5332025c30f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c956f-4c36-70d1-a91f-3d7fbafe6cc5" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019c956f-4c36-70d0-a40c-d5332025c30f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019c956f-4c36-70d0-a40c-d5332025c30f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019c956f-4c36-70d0-a40c-d5332025c30f" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019c956f-4c36-70d0-a40c-d5332025c30f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019c956f-4c36-78c1-a0e2-243799bc9190" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019c956f-4c36-70d0-a40c-d5332025c30f" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019c956f-4c36-78c1-a0e2-243799bc9190" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_IndemnificationAgreementsHoechstMember_019c956f-4c36-7582-813c-68274f5b657e" xlink:href="ce-20260331.xsd#ce_IndemnificationAgreementsHoechstMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019c956f-4c36-78c1-a0e2-243799bc9190" xlink:to="loc_ce_IndemnificationAgreementsHoechstMember_019c956f-4c36-7582-813c-68274f5b657e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_DivestitureAgreementsMember_019c956f-4c36-7264-814e-c46dd8d29f97" xlink:href="ce-20260331.xsd#ce_DivestitureAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019c956f-4c36-78c1-a0e2-243799bc9190" xlink:to="loc_ce_DivestitureAgreementsMember_019c956f-4c36-7264-814e-c46dd8d29f97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_NumberOfDivestitureAgreements_019c956f-4c36-7f34-b509-154dbe215316" xlink:href="ce-20260331.xsd#ce_NumberOfDivestitureAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c956f-4c36-73c8-a05e-e9327c15406b" xlink:to="loc_ce_NumberOfDivestitureAgreements_019c956f-4c36-7f34-b509-154dbe215316" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_IndemnificationFloorAmount_019c956f-4c36-7141-95c5-65b2e4dab2bf" xlink:href="ce-20260331.xsd#ce_IndemnificationFloorAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c956f-4c36-73c8-a05e-e9327c15406b" xlink:to="loc_ce_IndemnificationFloorAmount_019c956f-4c36-7141-95c5-65b2e4dab2bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_IndemnificationCeilingAmount_019c956f-4c36-73dd-b988-cbd25ccd30ec" xlink:href="ce-20260331.xsd#ce_IndemnificationCeilingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c956f-4c36-73c8-a05e-e9327c15406b" xlink:to="loc_ce_IndemnificationCeilingAmount_019c956f-4c36-73dd-b988-cbd25ccd30ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_IndemnificationPercentageExceedingCeilingAmount_019c956f-4c36-702c-9fa8-dc35e33d0fd2" xlink:href="ce-20260331.xsd#ce_IndemnificationPercentageExceedingCeilingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c956f-4c36-73c8-a05e-e9327c15406b" xlink:to="loc_ce_IndemnificationPercentageExceedingCeilingAmount_019c956f-4c36-702c-9fa8-dc35e33d0fd2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualPayments_019c956f-4c36-7a86-8f59-24dc5afb2452" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyAccrualPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c956f-4c36-73c8-a05e-e9327c15406b" xlink:to="loc_us-gaap_LossContingencyAccrualPayments_019c956f-4c36-7a86-8f59-24dc5afb2452" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_IndemnificationPercentageOther_019c956f-4c36-7f74-a183-0291cba77f5b" xlink:href="ce-20260331.xsd#ce_IndemnificationPercentageOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c956f-4c36-73c8-a05e-e9327c15406b" xlink:to="loc_ce_IndemnificationPercentageOther_019c956f-4c36-7f74-a183-0291cba77f5b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_019c956f-4c36-7c0a-b419-c872f3fb3a30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c956f-4c36-73c8-a05e-e9327c15406b" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_019c956f-4c36-7c0a-b419-c872f3fb3a30" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyPendingClaimsNumber_019dfed2-3955-780a-83e9-290cf2395066" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyPendingClaimsNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c956f-4c36-73c8-a05e-e9327c15406b" xlink:to="loc_us-gaap_LossContingencyPendingClaimsNumber_019dfed2-3955-780a-83e9-290cf2395066" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/SegmentInformationScheduleofBusinessSegmentsDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#SegmentInformationScheduleofBusinessSegmentsDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/SegmentInformationScheduleofBusinessSegmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c956f-4c36-775e-b299-b3609ea58071" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c956f-4c36-775e-b299-b3609ea58071" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019c956f-4c36-7419-9f35-83382c1aee37" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c956f-4c36-775e-b299-b3609ea58071" xlink:to="loc_srt_ConsolidationItemsAxis_019c956f-4c36-7419-9f35-83382c1aee37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c956f-4c36-7419-9f35-83382c1aee37_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019c956f-4c36-7419-9f35-83382c1aee37" xlink:to="loc_srt_ConsolidationItemsDomain_019c956f-4c36-7419-9f35-83382c1aee37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c956f-4c36-72f0-a1b2-6424eb85f2ac" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019c956f-4c36-7419-9f35-83382c1aee37" xlink:to="loc_srt_ConsolidationItemsDomain_019c956f-4c36-72f0-a1b2-6424eb85f2ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019c956f-4c36-7ac5-8c9b-0a4b8fd78910" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c956f-4c36-72f0-a1b2-6424eb85f2ac" xlink:to="loc_us-gaap_OperatingSegmentsMember_019c956f-4c36-7ac5-8c9b-0a4b8fd78910" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019c956f-4c36-7448-9c21-95148ee665a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c956f-4c36-72f0-a1b2-6424eb85f2ac" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019c956f-4c36-7448-9c21-95148ee665a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019c956f-4c36-702b-a9d7-7142a4859c1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c956f-4c36-72f0-a1b2-6424eb85f2ac" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019c956f-4c36-702b-a9d7-7142a4859c1d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-779e-a9cf-130d7371d94a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c956f-4c36-775e-b299-b3609ea58071" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-779e-a9cf-130d7371d94a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c956f-4c36-779e-a9cf-130d7371d94a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-779e-a9cf-130d7371d94a" xlink:to="loc_us-gaap_SegmentDomain_019c956f-4c36-779e-a9cf-130d7371d94a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c956f-4c36-738b-ac2f-d14e8cd02a72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-779e-a9cf-130d7371d94a" xlink:to="loc_us-gaap_SegmentDomain_019c956f-4c36-738b-ac2f-d14e8cd02a72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EngineeredMaterialsMember_019c956f-4c36-71b7-95d6-2670e45acfe8" xlink:href="ce-20260331.xsd#ce_EngineeredMaterialsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c956f-4c36-738b-ac2f-d14e8cd02a72" xlink:to="loc_ce_EngineeredMaterialsMember_019c956f-4c36-71b7-95d6-2670e45acfe8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_AcetylChainMember_019c956f-4c36-7dc2-92ca-bffe625bd025" xlink:href="ce-20260331.xsd#ce_AcetylChainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c956f-4c36-738b-ac2f-d14e8cd02a72" xlink:to="loc_ce_AcetylChainMember_019c956f-4c36-7dc2-92ca-bffe625bd025" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_019c956f-4c36-7c69-9da2-e321638a8018" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c956f-4c36-738b-ac2f-d14e8cd02a72" xlink:to="loc_us-gaap_CorporateAndOtherMember_019c956f-4c36-7c69-9da2-e321638a8018" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c956f-4c36-7508-9a20-00e94f6564a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c956f-4c36-7508-9a20-00e94f6564a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019c956f-4c36-78f2-97b0-839827eb8351" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019c956f-4c36-78f2-97b0-839827eb8351" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019c956f-4c36-7099-b0c9-d29b319ace13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_GrossProfit_019c956f-4c36-7099-b0c9-d29b319ace13" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019c956f-4c36-7b73-a987-da5182fbf79c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019c956f-4c36-7b73-a987-da5182fbf79c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019c956f-4c36-7ae8-85be-810b2b6975b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019c956f-4c36-7ae8-85be-810b2b6975b6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_019c956f-4c36-76df-acaa-222ea6856383" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_019c956f-4c36-76df-acaa-222ea6856383" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonrecurringIncomeExpense_019c956f-4c36-795e-8184-e24a993f7cfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonrecurringIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_OtherNonrecurringIncomeExpense_019c956f-4c36-795e-8184-e24a993f7cfa" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_019c956f-4c36-76f3-9723-21ed2dbd4352" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_019c956f-4c36-76f3-9723-21ed2dbd4352" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019c956f-4c36-7603-a08b-fa3bf17d90df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019c956f-4c36-7603-a08b-fa3bf17d90df" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019c956f-4c36-7116-8dac-fce8e9560cd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_OperatingIncomeLoss_019c956f-4c36-7116-8dac-fce8e9560cd9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019c956f-4c36-7b58-8130-d973c6f03df1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019c956f-4c36-7b58-8130-d973c6f03df1" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019c956f-4c36-7ae8-93f7-b4c61340f5b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019c956f-4c36-7ae8-93f7-b4c61340f5b7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019c956f-4c36-70a3-93ca-145d706c60cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentExpenditureAdditionToLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019c956f-4c36-70a3-93ca-145d706c60cb" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_019c956f-4c36-7fc3-a9ad-d372d2790412" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_019c956f-4c36-7fc3-a9ad-d372d2790412" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019c956f-4c36-72b8-a0ff-c6f057afb674" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_us-gaap_Assets_019c956f-4c36-72b8-a0ff-c6f057afb674" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_IncreaseDecreaseOfAccruedCapitalExpenditures_019c956f-4c36-791a-b5b1-b188215edffe" xlink:href="ce-20260331.xsd#ce_IncreaseDecreaseOfAccruedCapitalExpenditures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c956f-4c36-7823-9c72-64222ee12885" xlink:to="loc_ce_IncreaseDecreaseOfAccruedCapitalExpenditures_019c956f-4c36-791a-b5b1-b188215edffe" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#RevenueRecognitionRemainingPerformanceObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019c956f-4c36-7755-ad81-e1296c00a47d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EntityWideRevenueMajorCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019c956f-4c36-7d91-8e2d-09705cbd3226" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019c956f-4c36-7755-ad81-e1296c00a47d" xlink:to="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019c956f-4c36-7d91-8e2d-09705cbd3226" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019c956f-4c36-7b79-b16a-1d291f120859" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019c956f-4c36-7d91-8e2d-09705cbd3226" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019c956f-4c36-7b79-b16a-1d291f120859" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019c956f-4c36-7f3b-b5a6-25839f7b8958" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019c956f-4c36-7755-ad81-e1296c00a47d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019c956f-4c36-7f3b-b5a6-25839f7b8958" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019c956f-4c36-7080-9c9b-3342fbb8eb1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019c956f-4c36-7755-ad81-e1296c00a47d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019c956f-4c36-7080-9c9b-3342fbb8eb1e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails_1" xlink:type="simple" xlink:href="ce-20260331.xsd#RevenueRecognitionRemainingPerformanceObligationsDetails_1"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019c956f-4c36-7755-ad81-e1296c00a47d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EntityWideRevenueMajorCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019c956f-4c36-7d91-8e2d-09705cbd3226" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019c956f-4c36-7755-ad81-e1296c00a47d" xlink:to="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019c956f-4c36-7d91-8e2d-09705cbd3226" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019c956f-4c36-7f3b-b5a6-25839f7b8958" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019c956f-4c36-7755-ad81-e1296c00a47d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019c956f-4c36-7f3b-b5a6-25839f7b8958" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019c956f-4c36-7080-9c9b-3342fbb8eb1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019c956f-4c36-7755-ad81-e1296c00a47d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019c956f-4c36-7080-9c9b-3342fbb8eb1e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/RevenueRecognitionDisaggregationofnetsalesDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#RevenueRecognitionDisaggregationofnetsalesDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/RevenueRecognitionDisaggregationofnetsalesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c956f-4c36-761b-b4b2-c65285492408" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c956f-4c36-7516-8e30-2e04de1bcc90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c956f-4c36-761b-b4b2-c65285492408" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c956f-4c36-7516-8e30-2e04de1bcc90" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c956f-4c36-71d7-a610-4c599e08ac9f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c956f-4c36-7516-8e30-2e04de1bcc90" xlink:to="loc_srt_StatementGeographicalAxis_019c956f-4c36-71d7-a610-4c599e08ac9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c956f-4c36-71d7-a610-4c599e08ac9f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c956f-4c36-71d7-a610-4c599e08ac9f" xlink:to="loc_srt_SegmentGeographicalDomain_019c956f-4c36-71d7-a610-4c599e08ac9f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c956f-4c36-7cc1-9391-4af392417faf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c956f-4c36-71d7-a610-4c599e08ac9f" xlink:to="loc_srt_SegmentGeographicalDomain_019c956f-4c36-7cc1-9391-4af392417faf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NorthAmericaMember_019c956f-4c36-7fc2-bb39-8711d4c917e2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NorthAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c956f-4c36-7cc1-9391-4af392417faf" xlink:to="loc_srt_NorthAmericaMember_019c956f-4c36-7fc2-bb39-8711d4c917e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_019c956f-4c36-7dec-a05d-7c8407ce9f3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c956f-4c36-7cc1-9391-4af392417faf" xlink:to="loc_us-gaap_EMEAMember_019c956f-4c36-7dec-a05d-7c8407ce9f3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_019c956f-4c36-73e7-877e-53e27bee6441" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c956f-4c36-7cc1-9391-4af392417faf" xlink:to="loc_srt_AsiaPacificMember_019c956f-4c36-73e7-877e-53e27bee6441" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SouthAmericaMember_019c956f-4c36-70d5-a1ea-2228457fc971" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SouthAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c956f-4c36-7cc1-9391-4af392417faf" xlink:to="loc_srt_SouthAmericaMember_019c956f-4c36-70d5-a1ea-2228457fc971" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019c956f-4c36-744f-9802-dee572396726" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c956f-4c36-7516-8e30-2e04de1bcc90" xlink:to="loc_srt_ConsolidationItemsAxis_019c956f-4c36-744f-9802-dee572396726" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c956f-4c36-744f-9802-dee572396726_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019c956f-4c36-744f-9802-dee572396726" xlink:to="loc_srt_ConsolidationItemsDomain_019c956f-4c36-744f-9802-dee572396726_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c956f-4c36-7cad-8d2f-a2ae47616cda" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019c956f-4c36-744f-9802-dee572396726" xlink:to="loc_srt_ConsolidationItemsDomain_019c956f-4c36-7cad-8d2f-a2ae47616cda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019c956f-4c36-708f-9c0d-381cde9ab8df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c956f-4c36-7cad-8d2f-a2ae47616cda" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019c956f-4c36-708f-9c0d-381cde9ab8df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-70a4-91fe-714816db9503" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c956f-4c36-7516-8e30-2e04de1bcc90" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-70a4-91fe-714816db9503" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c956f-4c36-70a4-91fe-714816db9503_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-70a4-91fe-714816db9503" xlink:to="loc_us-gaap_SegmentDomain_019c956f-4c36-70a4-91fe-714816db9503_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c956f-4c36-7c27-91a0-446c9472868f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-70a4-91fe-714816db9503" xlink:to="loc_us-gaap_SegmentDomain_019c956f-4c36-7c27-91a0-446c9472868f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EngineeredMaterialsMember_019c956f-4c36-72ee-90d1-362b264e6d7a" xlink:href="ce-20260331.xsd#ce_EngineeredMaterialsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c956f-4c36-7c27-91a0-446c9472868f" xlink:to="loc_ce_EngineeredMaterialsMember_019c956f-4c36-72ee-90d1-362b264e6d7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_AcetylChainMember_019c956f-4c36-77a7-b0aa-a93507a3c3ff" xlink:href="ce-20260331.xsd#ce_AcetylChainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c956f-4c36-7c27-91a0-446c9472868f" xlink:to="loc_ce_AcetylChainMember_019c956f-4c36-77a7-b0aa-a93507a3c3ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019ddcbc-1a62-7f52-9880-355fe7987690" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c956f-4c36-7516-8e30-2e04de1bcc90" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019ddcbc-1a62-7f52-9880-355fe7987690" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c956f-4c36-723d-a532-857f4874fa83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c956f-4c36-761b-b4b2-c65285492408" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c956f-4c36-723d-a532-857f4874fa83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019ddcbc-1a62-7368-9898-465801ae6cdc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c956f-4c36-761b-b4b2-c65285492408" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019ddcbc-1a62-7368-9898-465801ae6cdc" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/RevenueRecognitionDisaggregationofnetsalesDetails_1" xlink:type="simple" xlink:href="ce-20260331.xsd#RevenueRecognitionDisaggregationofnetsalesDetails_1"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/RevenueRecognitionDisaggregationofnetsalesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c956f-4c36-761b-b4b2-c65285492408" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c956f-4c36-7516-8e30-2e04de1bcc90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c956f-4c36-761b-b4b2-c65285492408" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c956f-4c36-7516-8e30-2e04de1bcc90" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c956f-4c36-71d7-a610-4c599e08ac9f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c956f-4c36-7516-8e30-2e04de1bcc90" xlink:to="loc_srt_StatementGeographicalAxis_019c956f-4c36-71d7-a610-4c599e08ac9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c956f-4c36-71d7-a610-4c599e08ac9f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c956f-4c36-71d7-a610-4c599e08ac9f" xlink:to="loc_srt_SegmentGeographicalDomain_019c956f-4c36-71d7-a610-4c599e08ac9f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c956f-4c36-7cc1-9391-4af392417faf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c956f-4c36-71d7-a610-4c599e08ac9f" xlink:to="loc_srt_SegmentGeographicalDomain_019c956f-4c36-7cc1-9391-4af392417faf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NorthAmericaMember_019c956f-4c36-7fc2-bb39-8711d4c917e2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NorthAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c956f-4c36-7cc1-9391-4af392417faf" xlink:to="loc_srt_NorthAmericaMember_019c956f-4c36-7fc2-bb39-8711d4c917e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_019c956f-4c36-7dec-a05d-7c8407ce9f3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c956f-4c36-7cc1-9391-4af392417faf" xlink:to="loc_us-gaap_EMEAMember_019c956f-4c36-7dec-a05d-7c8407ce9f3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_019c956f-4c36-73e7-877e-53e27bee6441" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c956f-4c36-7cc1-9391-4af392417faf" xlink:to="loc_srt_AsiaPacificMember_019c956f-4c36-73e7-877e-53e27bee6441" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SouthAmericaMember_019c956f-4c36-70d5-a1ea-2228457fc971" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SouthAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c956f-4c36-7cc1-9391-4af392417faf" xlink:to="loc_srt_SouthAmericaMember_019c956f-4c36-70d5-a1ea-2228457fc971" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019c956f-4c36-744f-9802-dee572396726" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c956f-4c36-7516-8e30-2e04de1bcc90" xlink:to="loc_srt_ConsolidationItemsAxis_019c956f-4c36-744f-9802-dee572396726" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c956f-4c36-744f-9802-dee572396726_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019c956f-4c36-744f-9802-dee572396726" xlink:to="loc_srt_ConsolidationItemsDomain_019c956f-4c36-744f-9802-dee572396726_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c956f-4c36-7cad-8d2f-a2ae47616cda" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019c956f-4c36-744f-9802-dee572396726" xlink:to="loc_srt_ConsolidationItemsDomain_019c956f-4c36-7cad-8d2f-a2ae47616cda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019c956f-4c36-708f-9c0d-381cde9ab8df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c956f-4c36-7cad-8d2f-a2ae47616cda" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019c956f-4c36-708f-9c0d-381cde9ab8df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-70a4-91fe-714816db9503" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c956f-4c36-7516-8e30-2e04de1bcc90" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-70a4-91fe-714816db9503" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c956f-4c36-70a4-91fe-714816db9503_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-70a4-91fe-714816db9503" xlink:to="loc_us-gaap_SegmentDomain_019c956f-4c36-70a4-91fe-714816db9503_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c956f-4c36-7c27-91a0-446c9472868f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-70a4-91fe-714816db9503" xlink:to="loc_us-gaap_SegmentDomain_019c956f-4c36-7c27-91a0-446c9472868f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EngineeredMaterialsMember_019c956f-4c36-72ee-90d1-362b264e6d7a" xlink:href="ce-20260331.xsd#ce_EngineeredMaterialsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c956f-4c36-7c27-91a0-446c9472868f" xlink:to="loc_ce_EngineeredMaterialsMember_019c956f-4c36-72ee-90d1-362b264e6d7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_AcetylChainMember_019c956f-4c36-77a7-b0aa-a93507a3c3ff" xlink:href="ce-20260331.xsd#ce_AcetylChainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c956f-4c36-7c27-91a0-446c9472868f" xlink:to="loc_ce_AcetylChainMember_019c956f-4c36-77a7-b0aa-a93507a3c3ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c956f-4c36-723d-a532-857f4874fa83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c956f-4c36-761b-b4b2-c65285492408" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c956f-4c36-723d-a532-857f4874fa83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019ddcbc-1a62-7368-9898-465801ae6cdc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c956f-4c36-761b-b4b2-c65285492408" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019ddcbc-1a62-7368-9898-465801ae6cdc" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/EarningsLossPerShareNarrativeDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#EarningsLossPerShareNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/EarningsLossPerShareNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019c956f-4c36-7c74-b077-ac0f5fc149b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019c956f-4c36-7cff-a6c1-2fb5961af5ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019c956f-4c36-7c74-b077-ac0f5fc149b2" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019c956f-4c36-7cff-a6c1-2fb5961af5ba" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019c956f-4c36-7e70-bffe-9a8711aa8453" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019c956f-4c36-7cff-a6c1-2fb5961af5ba" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019c956f-4c36-7e70-bffe-9a8711aa8453" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c956f-4c36-7e70-bffe-9a8711aa8453_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019c956f-4c36-7e70-bffe-9a8711aa8453" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c956f-4c36-7e70-bffe-9a8711aa8453_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c956f-4c36-72b3-8565-173f0abf3eae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019c956f-4c36-7e70-bffe-9a8711aa8453" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c956f-4c36-72b3-8565-173f0abf3eae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019c956f-4c36-7c84-ac0c-b651e68f6833" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c956f-4c36-72b3-8565-173f0abf3eae" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019c956f-4c36-7c84-ac0c-b651e68f6833" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c956f-4c36-798c-b1a7-0dc499a8271b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c956f-4c36-72b3-8565-173f0abf3eae" xlink:to="loc_us-gaap_CommonStockMember_019c956f-4c36-798c-b1a7-0dc499a8271b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019c956f-4c36-743b-bce4-212e3259b5fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c956f-4c36-72b3-8565-173f0abf3eae" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019c956f-4c36-743b-bce4-212e3259b5fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019c956f-4c36-7aed-9600-4ec12d05c3b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019c956f-4c36-7c74-b077-ac0f5fc149b2" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019c956f-4c36-7aed-9600-4ec12d05c3b5" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.celanese.com/role/OtherChargesGainsNetScheduleofRestructuringReservebyTypeofCostDetails" xlink:type="simple" xlink:href="ce-20260331.xsd#OtherChargesGainsNetScheduleofRestructuringReservebyTypeofCostDetails"/>
  <link:definitionLink xlink:role="http://www.celanese.com/role/OtherChargesGainsNetScheduleofRestructuringReservebyTypeofCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019c956f-4c36-70ef-bcd7-7821c3d25eb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c956f-4c36-73f9-bef0-9b448a131288" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c956f-4c36-70ef-bcd7-7821c3d25eb8" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c956f-4c36-73f9-bef0-9b448a131288" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_019c956f-4c36-7cca-a456-d20e243a0d64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c956f-4c36-73f9-bef0-9b448a131288" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_019c956f-4c36-7cca-a456-d20e243a0d64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019c956f-4c36-7cca-a456-d20e243a0d64_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019c956f-4c36-7cca-a456-d20e243a0d64" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019c956f-4c36-7cca-a456-d20e243a0d64_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019c956f-4c36-791e-9ca1-e93abbf0ce4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019c956f-4c36-7cca-a456-d20e243a0d64" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019c956f-4c36-791e-9ca1-e93abbf0ce4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_019c956f-4c36-7a7b-aaea-3c126a0c350b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019c956f-4c36-791e-9ca1-e93abbf0ce4e" xlink:to="loc_us-gaap_EmployeeSeveranceMember_019c956f-4c36-7a7b-aaea-3c126a0c350b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-751e-b31f-04dd78e0f820" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c956f-4c36-73f9-bef0-9b448a131288" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-751e-b31f-04dd78e0f820" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c956f-4c36-751e-b31f-04dd78e0f820_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-751e-b31f-04dd78e0f820" xlink:to="loc_us-gaap_SegmentDomain_019c956f-4c36-751e-b31f-04dd78e0f820_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c956f-4c36-7838-8b83-e7ea04ab432a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c956f-4c36-751e-b31f-04dd78e0f820" xlink:to="loc_us-gaap_SegmentDomain_019c956f-4c36-7838-8b83-e7ea04ab432a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_EngineeredMaterialsMember_019c956f-4c36-7c09-8124-75c392692357" xlink:href="ce-20260331.xsd#ce_EngineeredMaterialsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c956f-4c36-7838-8b83-e7ea04ab432a" xlink:to="loc_ce_EngineeredMaterialsMember_019c956f-4c36-7c09-8124-75c392692357" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ce_AcetylChainMember_019c956f-4c36-7913-96fd-3ee886fabfc5" xlink:href="ce-20260331.xsd#ce_AcetylChainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c956f-4c36-7838-8b83-e7ea04ab432a" xlink:to="loc_ce_AcetylChainMember_019c956f-4c36-7913-96fd-3ee886fabfc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_019c956f-4c36-77d3-af0d-13b63b45b11f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c956f-4c36-7838-8b83-e7ea04ab432a" xlink:to="loc_us-gaap_CorporateAndOtherMember_019c956f-4c36-77d3-af0d-13b63b45b11f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_019c956f-4c36-72e8-bf30-30163265dfdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c956f-4c36-70ef-bcd7-7821c3d25eb8" xlink:to="loc_us-gaap_RestructuringReserveRollForward_019c956f-4c36-72e8-bf30-30163265dfdf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_019c956f-4c36-7f5a-bbce-b13151e8aa7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019c956f-4c36-72e8-bf30-30163265dfdf" xlink:to="loc_us-gaap_RestructuringReserve_019c956f-4c36-7f5a-bbce-b13151e8aa7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019c956f-4c36-7f0e-a435-bbb5355d5249" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019c956f-4c36-72e8-bf30-30163265dfdf" xlink:to="loc_us-gaap_RestructuringCharges_019c956f-4c36-7f0e-a435-bbb5355d5249" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_019c956f-4c36-7dc2-9f65-03d44a32bc82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019c956f-4c36-72e8-bf30-30163265dfdf" xlink:to="loc_us-gaap_PaymentsForRestructuring_019c956f-4c36-7dc2-9f65-03d44a32bc82" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_019c956f-4c36-7dcb-85f4-fa4efbfabf46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserve"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:type="arc" order="691"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_OtherAssetsCurrent" xlink:type="arc" order="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_OtherAssetsNoncurrent" xlink:type="arc" order="102"/>
  </link:definitionLink>
</link:linkbase>
