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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019efbec-d790-7e8d-b09d-a5b5fa9dbd8a,g:3fb5636b-8add-42c0-b0cd-f0c5ebe59032-->
<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.synopsys.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="simple" xlink:href="snps-20260731.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019efbec-d983-71db-be07-ea774ddd0ce3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_StatementTable_019efbec-d983-71db-be07-ea774ddd0ce3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019efbec-d983-7ccf-a09d-0902cc2e0902" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019efbec-d983-71db-be07-ea774ddd0ce3" xlink:to="loc_srt_ProductOrServiceAxis_019efbec-d983-7ccf-a09d-0902cc2e0902" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019efbec-d983-7ccf-a09d-0902cc2e0902_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019efbec-d983-7ccf-a09d-0902cc2e0902" xlink:to="loc_srt_ProductsAndServicesDomain_019efbec-d983-7ccf-a09d-0902cc2e0902_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019efbec-d983-705b-913d-7aa354f1e7d3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019efbec-d983-7ccf-a09d-0902cc2e0902" xlink:to="loc_srt_ProductsAndServicesDomain_019efbec-d983-705b-913d-7aa354f1e7d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_019efbec-d983-7812-a48b-6088ca11bbb6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019efbec-d983-705b-913d-7aa354f1e7d3" xlink:to="loc_us-gaap_ProductMember_019efbec-d983-7812-a48b-6088ca11bbb6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicenseAndMaintenanceMember_019efbec-d983-7c2e-8652-3fd49e2a859f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LicenseAndMaintenanceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductMember_019efbec-d983-7812-a48b-6088ca11bbb6" xlink:to="loc_us-gaap_LicenseAndMaintenanceMember_019efbec-d983-7c2e-8652-3fd49e2a859f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicenseMember_019efbec-d983-7cda-b5a6-1b0d3c8493ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LicenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductMember_019efbec-d983-7812-a48b-6088ca11bbb6" xlink:to="loc_us-gaap_LicenseMember_019efbec-d983-7cda-b5a6-1b0d3c8493ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyServiceMember_019efbec-d983-7d95-8320-85673e6e1d7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TechnologyServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019efbec-d983-705b-913d-7aa354f1e7d3" xlink:to="loc_us-gaap_TechnologyServiceMember_019efbec-d983-7d95-8320-85673e6e1d7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_019efbec-d983-7675-b1d2-1618322e38c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_RevenuesAbstract_019efbec-d983-7675-b1d2-1618322e38c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019efbec-d983-7ae8-8e48-77190127e15e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019efbec-d983-7675-b1d2-1618322e38c2" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019efbec-d983-7ae8-8e48-77190127e15e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenueAbstract_019efbec-d983-747f-adf7-005daa26dce1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfRevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_CostOfRevenueAbstract_019efbec-d983-747f-adf7-005daa26dce1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019efbec-d983-744f-b7dd-3750d99d00f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_019efbec-d983-747f-adf7-005daa26dce1" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019efbec-d983-744f-b7dd-3750d99d00f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostDepreciationAmortizationAndDepletion_019efbec-d983-783b-907c-9b53ea6f3c41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostDepreciationAmortizationAndDepletion"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_019efbec-d983-747f-adf7-005daa26dce1" xlink:to="loc_us-gaap_CostDepreciationAmortizationAndDepletion_019efbec-d983-783b-907c-9b53ea6f3c41" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_019efbec-d983-7eb4-a929-303e4dc6e424" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_019efbec-d983-747f-adf7-005daa26dce1" xlink:to="loc_us-gaap_CostOfRevenue_019efbec-d983-7eb4-a929-303e4dc6e424" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019efbec-d983-7418-bc59-337929ad336c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_GrossProfit_019efbec-d983-7418-bc59-337929ad336c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_019efbec-d983-71c1-8787-73b1f184e86a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_OperatingExpensesAbstract_019efbec-d983-71c1-8787-73b1f184e86a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_019efbec-d983-78a1-aa39-3452ea30f8d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019efbec-d983-71c1-8787-73b1f184e86a" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_019efbec-d983-78a1-aa39-3452ea30f8d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_019efbec-d983-76a9-864d-a43892aae93a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019efbec-d983-71c1-8787-73b1f184e86a" xlink:to="loc_us-gaap_SellingAndMarketingExpense_019efbec-d983-76a9-864d-a43892aae93a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019efbec-d983-779e-aaf3-0274bbd111c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019efbec-d983-71c1-8787-73b1f184e86a" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019efbec-d983-779e-aaf3-0274bbd111c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019efbec-d983-7940-9429-892c54bbf5f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019efbec-d983-71c1-8787-73b1f184e86a" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019efbec-d983-7940-9429-892c54bbf5f8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019efbec-d983-7932-8596-dab7e5cce5be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019efbec-d983-71c1-8787-73b1f184e86a" xlink:to="loc_us-gaap_RestructuringCharges_019efbec-d983-7932-8596-dab7e5cce5be" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019efbec-d983-7ad7-90c9-c8f132451a50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019efbec-d983-71c1-8787-73b1f184e86a" xlink:to="loc_us-gaap_OperatingExpenses_019efbec-d983-7ad7-90c9-c8f132451a50" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019efbec-d983-75ea-ae6b-08b2ea839133" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_OperatingIncomeLoss_019efbec-d983-75ea-ae6b-08b2ea839133" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019efbec-d983-7ee3-83e0-ff71d87a2cee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019efbec-d983-7ee3-83e0-ff71d87a2cee" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019efbec-d983-7362-884a-37c4fd3702bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_019efbec-d983-7362-884a-37c4fd3702bb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019efbec-d983-7621-bcab-864bc05e7fc4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019efbec-d983-7621-bcab-864bc05e7fc4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019efbec-d983-78a4-baeb-6ed44d2a9fe5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019efbec-d983-78a4-baeb-6ed44d2a9fe5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_019efbec-d983-75ea-83da-5b334359ec88" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_019efbec-d983-75ea-83da-5b334359ec88" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_019efbec-d983-73f9-aaac-0de0e87bbff7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_019efbec-d983-73f9-aaac-0de0e87bbff7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019efbec-d983-7817-8fd1-8806ce53932e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_ProfitLoss_019efbec-d983-7817-8fd1-8806ce53932e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019efbec-d983-7877-a472-3edd261d1d67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019efbec-d983-7877-a472-3edd261d1d67" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019efbec-d983-7ba2-9317-84f647c3bd00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_NetIncomeLoss_019efbec-d983-7ba2-9317-84f647c3bd00" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_019efbec-d983-7fb5-947e-46dd8532324d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_019efbec-d983-7fb5-947e-46dd8532324d" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_019efbec-d983-7618-b790-e0d5bae8dd1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_019efbec-d983-7fb5-947e-46dd8532324d" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_019efbec-d983-7618-b790-e0d5bae8dd1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_019efbec-d983-7d63-afdb-627ad7cedd2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_019efbec-d983-7fb5-947e-46dd8532324d" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_019efbec-d983-7d63-afdb-627ad7cedd2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019efbec-d983-720d-a73d-f83ab09726e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_019efbec-d983-7551-853c-3b73f64efac0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_019efbec-d983-7551-853c-3b73f64efac0" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_019efbec-d983-733c-8634-0dc2f9964dec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_019efbec-d983-7551-853c-3b73f64efac0" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_019efbec-d983-733c-8634-0dc2f9964dec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_019efbec-d983-7cdd-a70f-c8bd1a0921bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_019efbec-d983-7551-853c-3b73f64efac0" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_019efbec-d983-7cdd-a70f-c8bd1a0921bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019efbec-d983-704e-a1d8-4b1a1be5a8e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_019efbec-d983-7551-853c-3b73f64efac0" xlink:to="loc_us-gaap_EarningsPerShareBasic_019efbec-d983-704e-a1d8-4b1a1be5a8e1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_019efbec-d983-7543-a6b0-74f146826e78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDilutedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_019efbec-d983-7543-a6b0-74f146826e78" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_019efbec-d983-7397-ae8d-696a44a5d795" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_019efbec-d983-7543-a6b0-74f146826e78" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_019efbec-d983-7397-ae8d-696a44a5d795" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_019efbec-d983-7b16-83ac-b5aafce8c29c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_019efbec-d983-7543-a6b0-74f146826e78" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_019efbec-d983-7b16-83ac-b5aafce8c29c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019efbec-d983-7945-886b-387484623390" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_019efbec-d983-7543-a6b0-74f146826e78" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019efbec-d983-7945-886b-387484623390" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_SharesUsedInComputingPerShareAmountsAbstract_019efbec-d983-78f1-8639-53954f7f21b8" xlink:href="snps-20260731.xsd#snps_SharesUsedInComputingPerShareAmountsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7b8c-b646-7d3b99511aca" xlink:to="loc_snps_SharesUsedInComputingPerShareAmountsAbstract_019efbec-d983-78f1-8639-53954f7f21b8" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019efbec-d983-76a9-8848-24c3abe90add" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_SharesUsedInComputingPerShareAmountsAbstract_019efbec-d983-78f1-8639-53954f7f21b8" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019efbec-d983-76a9-8848-24c3abe90add" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019efbec-d983-71cd-9570-fadb53ffe096" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_SharesUsedInComputingPerShareAmountsAbstract_019efbec-d983-78f1-8639-53954f7f21b8" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019efbec-d983-71cd-9570-fadb53ffe096" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="snps-20260731.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019efbec-d983-7768-a94e-3c3353e47e68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019efbec-d983-77ad-a71e-02a5c53c0463" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7768-a94e-3c3353e47e68" xlink:to="loc_us-gaap_StatementTable_019efbec-d983-77ad-a71e-02a5c53c0463" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019efbec-d983-702e-82e7-f9834678f9e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019efbec-d983-77ad-a71e-02a5c53c0463" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019efbec-d983-702e-82e7-f9834678f9e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019efbec-d983-702e-82e7-f9834678f9e9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019efbec-d983-702e-82e7-f9834678f9e9" xlink:to="loc_us-gaap_EquityComponentDomain_019efbec-d983-702e-82e7-f9834678f9e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019efbec-d983-7276-9143-713a6197f968" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019efbec-d983-702e-82e7-f9834678f9e9" xlink:to="loc_us-gaap_EquityComponentDomain_019efbec-d983-7276-9143-713a6197f968" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_019efbec-d983-76c7-9171-74292d1392f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019efbec-d983-7276-9143-713a6197f968" xlink:to="loc_us-gaap_ParentMember_019efbec-d983-76c7-9171-74292d1392f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019efbec-d983-7e85-9688-84cf5abe1782" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019efbec-d983-76c7-9171-74292d1392f0" xlink:to="loc_us-gaap_CommonStockMember_019efbec-d983-7e85-9688-84cf5abe1782" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019efbec-d983-7e2a-843c-b7dd4a3cc485" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019efbec-d983-76c7-9171-74292d1392f0" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019efbec-d983-7e2a-843c-b7dd4a3cc485" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019efbec-d983-77a8-845e-6aea4d5a6d42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019efbec-d983-76c7-9171-74292d1392f0" xlink:to="loc_us-gaap_RetainedEarningsMember_019efbec-d983-77a8-845e-6aea4d5a6d42" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019efbec-d983-7024-8361-79dac9555d7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019efbec-d983-76c7-9171-74292d1392f0" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019efbec-d983-7024-8361-79dac9555d7b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019efbec-d983-7e95-a4e3-949b3f91ec8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019efbec-d983-76c7-9171-74292d1392f0" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019efbec-d983-7e95-a4e3-949b3f91ec8c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019efbec-d983-7b07-ae87-f92f0acaa124" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019efbec-d983-7276-9143-713a6197f968" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019efbec-d983-7b07-ae87-f92f0acaa124" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019f6450-a25c-718a-be03-b6fd7cbbf318" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019efbec-d983-77ad-a71e-02a5c53c0463" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019f6450-a25c-718a-be03-b6fd7cbbf318" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f6450-a25c-718a-be03-b6fd7cbbf318_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019f6450-a25c-718a-be03-b6fd7cbbf318" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f6450-a25c-718a-be03-b6fd7cbbf318_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f6450-a25c-7904-a078-fa5ec4367220" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019f6450-a25c-718a-be03-b6fd7cbbf318" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f6450-a25c-7904-a078-fa5ec4367220" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_AnsysIncMember_019f6451-08fd-742d-b8c5-6b3e36cef678" xlink:href="snps-20260731.xsd#snps_AnsysIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f6450-a25c-7904-a078-fa5ec4367220" xlink:to="loc_snps_AnsysIncMember_019f6451-08fd-742d-b8c5-6b3e36cef678" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_PriorAcquisitionMember_019fa2a6-bcb3-73ee-b7c6-6a86410d5ca2" xlink:href="snps-20260731.xsd#snps_PriorAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f6450-a25c-7904-a078-fa5ec4367220" xlink:to="loc_snps_PriorAcquisitionMember_019fa2a6-bcb3-73ee-b7c6-6a86410d5ca2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-7768-a94e-3c3353e47e68" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019efbec-d983-786d-a261-953217154fad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019efbec-d983-786d-a261-953217154fad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019efbec-d983-71bf-b51b-45d38197b8ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019efbec-d983-71bf-b51b-45d38197b8ad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestSeparatelyStated_019efbec-d983-7972-9e0b-38470afd4f39" xlink:href="snps-20260731.xsd#snps_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestSeparatelyStated"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_snps_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestSeparatelyStated_019efbec-d983-7972-9e0b-38470afd4f39" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019efbec-d983-77e0-a9f4-b46173093a28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019efbec-d983-77e0-a9f4-b46173093a28" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019efbec-d983-7981-8197-9c80dbc27abe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019efbec-d983-7981-8197-9c80dbc27abe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019efbec-d983-795a-b9cb-e6fa8de5ed9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019efbec-d983-795a-b9cb-e6fa8de5ed9f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_AdjustmentsToAdditionalPaidInCapitalEquityForwardContract_019efbec-d983-718a-87fb-a29681800f68" xlink:href="snps-20260731.xsd#snps_AdjustmentsToAdditionalPaidInCapitalEquityForwardContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_snps_AdjustmentsToAdditionalPaidInCapitalEquityForwardContract_019efbec-d983-718a-87fb-a29681800f68" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019efbec-d983-7c62-bf40-c68d915e1411" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019efbec-d983-7c62-bf40-c68d915e1411" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019efbec-d983-78d9-995a-ebbd308b074e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019efbec-d983-78d9-995a-ebbd308b074e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_019efbec-d983-7350-b77a-1bee50489ab9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_019efbec-d983-7350-b77a-1bee50489ab9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_019efbec-d983-79bd-8789-ad724f467bbe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_019efbec-d983-79bd-8789-ad724f467bbe" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_AdjustmentsToAdditionalPaidInCapitalStockBasedCompensationAwardsAssumedAcquisitions_019f2092-67cd-7028-ae63-6bbcb5d0019c" xlink:href="snps-20260731.xsd#snps_AdjustmentsToAdditionalPaidInCapitalStockBasedCompensationAwardsAssumedAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_snps_AdjustmentsToAdditionalPaidInCapitalStockBasedCompensationAwardsAssumedAcquisitions_019f2092-67cd-7028-ae63-6bbcb5d0019c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_RestrictedStockIssuedAndStockOptionsExercisedSharesNetOfTaxWithholdings_019efbec-d983-7751-b88f-254c2246ba7d" xlink:href="snps-20260731.xsd#snps_RestrictedStockIssuedAndStockOptionsExercisedSharesNetOfTaxWithholdings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_snps_RestrictedStockIssuedAndStockOptionsExercisedSharesNetOfTaxWithholdings_019efbec-d983-7751-b88f-254c2246ba7d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_RestrictedStockIssuedAndStockOptionsExercisedValueNetOfTaxWithholdings_019efbec-d983-7880-aa98-f784dccab31c" xlink:href="snps-20260731.xsd#snps_RestrictedStockIssuedAndStockOptionsExercisedValueNetOfTaxWithholdings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_snps_RestrictedStockIssuedAndStockOptionsExercisedValueNetOfTaxWithholdings_019efbec-d983-7880-aa98-f784dccab31c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019efbec-d983-77cc-a0e2-c6631cb65222" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019efbec-d983-77cc-a0e2-c6631cb65222" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestChangeInRedemptionValue_019efbec-d983-7b34-8e25-5d7cb38d5a1f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestChangeInRedemptionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_us-gaap_MinorityInterestChangeInRedemptionValue_019efbec-d983-7b34-8e25-5d7cb38d5a1f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_019efbec-d983-71ba-9990-661d7254bf04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019efbec-d983-73ff-8009-9760af5a7195" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_019efbec-d983-71ba-9990-661d7254bf04" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019efbec-d983-7372-9557-39ed82bd4c3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019efbec-d983-71f4-96ba-3607f0861e3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="snps-20260731.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019efbec-d983-74d2-b9d6-cfbac48367d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019efbec-d983-73c3-b934-815966be0960" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-74d2-b9d6-cfbac48367d6" xlink:to="loc_us-gaap_StatementTable_019efbec-d983-73c3-b934-815966be0960" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019efbec-d983-777a-ac2d-ef126ab18b99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019efbec-d983-73c3-b934-815966be0960" xlink:to="loc_us-gaap_DebtInstrumentAxis_019efbec-d983-777a-ac2d-ef126ab18b99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019efbec-d983-777a-ac2d-ef126ab18b99_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019efbec-d983-777a-ac2d-ef126ab18b99" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019efbec-d983-777a-ac2d-ef126ab18b99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019efbec-d983-721a-82cd-f5176394e060" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019efbec-d983-777a-ac2d-ef126ab18b99" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019efbec-d983-721a-82cd-f5176394e060" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_BridgeCommitmentMember_019efbec-d983-7c73-b4ba-b38c8d933ea1" xlink:href="snps-20260731.xsd#snps_BridgeCommitmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-d983-721a-82cd-f5176394e060" xlink:to="loc_snps_BridgeCommitmentMember_019efbec-d983-7c73-b4ba-b38c8d933ea1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_OtherDebtInstrumentsMember_019efbec-d983-747c-b9bf-d4ad86a46c0c" xlink:href="snps-20260731.xsd#snps_OtherDebtInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-d983-721a-82cd-f5176394e060" xlink:to="loc_snps_OtherDebtInstrumentsMember_019efbec-d983-747c-b9bf-d4ad86a46c0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-76b7-8a6a-c8c66ef0bed2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-74d2-b9d6-cfbac48367d6" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-76b7-8a6a-c8c66ef0bed2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019efbec-d983-7945-a5fe-0f11cb49348c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-76b7-8a6a-c8c66ef0bed2" xlink:to="loc_us-gaap_ProfitLoss_019efbec-d983-7945-a5fe-0f11cb49348c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-76b7-8a6a-c8c66ef0bed2" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019efbec-d983-782a-9918-234720492a3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019efbec-d983-782a-9918-234720492a3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_ReductionofOperatingLeaseRightofUseAssets_019efbec-d983-7080-a28c-2069d1a9da39" xlink:href="snps-20260731.xsd#snps_ReductionofOperatingLeaseRightofUseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_snps_ReductionofOperatingLeaseRightofUseAssets_019efbec-d983-7080-a28c-2069d1a9da39" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_019efbec-d983-77bd-a5df-c40372468dfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_019efbec-d983-77bd-a5df-c40372468dfe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019efbec-d983-7914-983f-82ce33c9c260" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_us-gaap_ShareBasedCompensation_019efbec-d983-7914-983f-82ce33c9c260" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_019efbec-d983-7bb0-9601-8a3c4f26257d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_019efbec-d983-7bb0-9601-8a3c4f26257d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfInvestments_019efbec-d983-749d-bc8b-811d2f54de54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_us-gaap_GainLossOnSaleOfInvestments_019efbec-d983-749d-bc8b-811d2f54de54" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_019efbec-d983-77dd-a7d9-f726f88d4e0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_019efbec-d983-77dd-a7d9-f726f88d4e0d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_019efbec-d983-7f48-93b2-690b98ff0679" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_019efbec-d983-7f48-93b2-690b98ff0679" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_019efbec-d983-70d3-a3da-ed6a2f56956d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_019efbec-d983-70d3-a3da-ed6a2f56956d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_019efbec-d983-71a0-bad3-bf66886a659c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_019efbec-d983-71a0-bad3-bf66886a659c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_019efbec-d983-73d7-846c-3269c081d8b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_019efbec-d983-73d7-846c-3269c081d8b3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019efbec-d983-7773-a538-3c0fe3e929d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019efbec-d983-7773-a538-3c0fe3e929d5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019efbec-d983-76da-adb2-6ef6d347f0e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019efbec-d983-7773-a538-3c0fe3e929d5" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019efbec-d983-76da-adb2-6ef6d347f0e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_019efbec-d983-7eea-b4a5-4cf8e2cda81e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019efbec-d983-7773-a538-3c0fe3e929d5" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_019efbec-d983-7eea-b4a5-4cf8e2cda81e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_019efbec-d983-7271-ac6a-ce14d5364818" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019efbec-d983-7773-a538-3c0fe3e929d5" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_019efbec-d983-7271-ac6a-ce14d5364818" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_019efbec-d983-7bba-ba44-84eb4b3ecf30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019efbec-d983-7773-a538-3c0fe3e929d5" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_019efbec-d983-7bba-ba44-84eb4b3ecf30" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_019efbec-d983-7c2f-b2d0-42bc5f40654c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019efbec-d983-7773-a538-3c0fe3e929d5" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_019efbec-d983-7c2f-b2d0-42bc5f40654c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_IncreaseDecreaseinOperatingLeaseLiabilities_019efbec-d983-70de-84a8-95f496be0957" xlink:href="snps-20260731.xsd#snps_IncreaseDecreaseinOperatingLeaseLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019efbec-d983-7773-a538-3c0fe3e929d5" xlink:to="loc_snps_IncreaseDecreaseinOperatingLeaseLiabilities_019efbec-d983-70de-84a8-95f496be0957" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_019efbec-d983-7708-a7b4-a0a06b47acfd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInIncomeTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019efbec-d983-7773-a538-3c0fe3e929d5" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_019efbec-d983-7708-a7b4-a0a06b47acfd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_019efbec-d983-7f30-bdb2-c8f298e7d6df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019efbec-d983-7773-a538-3c0fe3e929d5" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_019efbec-d983-7f30-bdb2-c8f298e7d6df" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_019efbec-d983-7024-8ab6-e0fbdf4f5b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrealizedGainLossOnDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-7690-8b2a-87365e5c16a4" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivatives_019efbec-d983-7024-8ab6-e0fbdf4f5b0d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019efbec-d983-75ed-a7c4-33d4c4839c31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019efbec-d983-76b7-8a6a-c8c66ef0bed2" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019efbec-d983-75ed-a7c4-33d4c4839c31" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-74d2-b9d6-cfbac48367d6" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments_019efbec-d983-7b70-b2bc-867549c10a8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments_019efbec-d983-7b70-b2bc-867549c10a8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfShortTermInvestments_019efbec-d983-7348-b4f4-12e6d9910714" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:to="loc_us-gaap_ProceedsFromSaleOfShortTermInvestments_019efbec-d983-7348-b4f4-12e6d9910714" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_019efbec-d983-7cc6-99f9-ffcc66de3dab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:to="loc_us-gaap_PaymentsToAcquireShortTermInvestments_019efbec-d983-7cc6-99f9-ffcc66de3dab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_019f20af-fc87-7fe3-9d17-f354a5c7cc65" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_019f20af-fc87-7fe3-9d17-f354a5c7cc65" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireOtherInvestments_019efbec-d983-73d7-898b-224a30948d15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireOtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:to="loc_us-gaap_PaymentsToAcquireOtherInvestments_019efbec-d983-73d7-898b-224a30948d15" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019efbec-d983-737a-ac4a-7aa589ea715d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019efbec-d983-737a-ac4a-7aa589ea715d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_019efbec-d983-7117-bde9-9cae4210078d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_019efbec-d983-7117-bde9-9cae4210078d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019f20b0-3c5f-7191-beb4-140bb9ff5098" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019f20b0-3c5f-7191-beb4-140bb9ff5098" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_019efbec-d983-7f01-b1ed-e498dcab1e1f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_019efbec-d983-7f01-b1ed-e498dcab1e1f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_019efbec-d983-77a8-9f20-784efeb9c6ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_019efbec-d983-77a8-9f20-784efeb9c6ac" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019efbec-d983-7123-bb95-550657fb42df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019efbec-d983-7671-9559-4ade9e0e19d7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019efbec-d983-7123-bb95-550657fb42df" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019efbec-d983-76c9-a20e-537a704b844e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-74d2-b9d6-cfbac48367d6" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019efbec-d983-76c9-a20e-537a704b844e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_019efbec-d983-711c-ad21-6b07cedff16f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019efbec-d983-76c9-a20e-537a704b844e" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_019efbec-d983-711c-ad21-6b07cedff16f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_019efbec-d983-7fa0-adcf-41cdf52b09ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019efbec-d983-76c9-a20e-537a704b844e" xlink:to="loc_us-gaap_RepaymentsOfDebt_019efbec-d983-7fa0-adcf-41cdf52b09ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019efbec-d983-7adb-abb1-6acf692b27e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019efbec-d983-76c9-a20e-537a704b844e" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019efbec-d983-7adb-abb1-6acf692b27e1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019efbec-d983-7c6c-97b8-e46c817b7698" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019efbec-d983-76c9-a20e-537a704b844e" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019efbec-d983-7c6c-97b8-e46c817b7698" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfPrivatePlacement_019efbec-d983-7db2-a937-9f4e21fc128d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfPrivatePlacement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019efbec-d983-76c9-a20e-537a704b844e" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfPrivatePlacement_019efbec-d983-7db2-a937-9f4e21fc128d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019efbec-d983-7710-88cb-887182366fbf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019efbec-d983-76c9-a20e-537a704b844e" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019efbec-d983-7710-88cb-887182366fbf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_019efbec-d983-7a46-a5a9-f4239318e0ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToMinorityShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019efbec-d983-76c9-a20e-537a704b844e" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_019efbec-d983-7a46-a5a9-f4239318e0ab" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_019f20b1-6ea2-7b4b-9a7f-f04a5254b68a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019efbec-d983-76c9-a20e-537a704b844e" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_019f20b1-6ea2-7b4b-9a7f-f04a5254b68a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019efbec-d983-7a6b-b26f-9b33806c9717" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019efbec-d983-76c9-a20e-537a704b844e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019efbec-d983-7a6b-b26f-9b33806c9717" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_019efbec-d983-72d0-989c-e7194331603a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-74d2-b9d6-cfbac48367d6" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_019efbec-d983-72d0-989c-e7194331603a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019efbec-d983-7a10-865a-6b577aa4c8ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-74d2-b9d6-cfbac48367d6" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019efbec-d983-7a10-865a-6b577aa4c8ea" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_019efbec-d983-7ab9-9eff-32c3374fa27f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019efbec-d983-74d2-b9d6-cfbac48367d6" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_019efbec-d983-7ab9-9eff-32c3374fa27f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_019efbec-d983-7d85-ad8d-7f2a87906079" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/SummaryofSignificantAccountingPoliciesandBasisofPresentationDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#SummaryofSignificantAccountingPoliciesandBasisofPresentationDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/SummaryofSignificantAccountingPoliciesandBasisofPresentationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-71bd-b960-a7876eacf050" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019efbec-d983-7009-b002-0f2046f78f20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-71bd-b960-a7876eacf050" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019efbec-d983-7009-b002-0f2046f78f20" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019efbec-d983-7bda-a516-edb48cb6106c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019efbec-d983-7009-b002-0f2046f78f20" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019efbec-d983-7bda-a516-edb48cb6106c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019efbec-d983-7bda-a516-edb48cb6106c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019efbec-d983-7bda-a516-edb48cb6106c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019efbec-d983-7bda-a516-edb48cb6106c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019efbec-d983-7d0f-a125-da9c4db20ad1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019efbec-d983-7bda-a516-edb48cb6106c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019efbec-d983-7d0f-a125-da9c4db20ad1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_AnsysIncMember_019efbec-d983-7853-9067-f3288ef9dac1" xlink:href="snps-20260731.xsd#snps_AnsysIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019efbec-d983-7d0f-a125-da9c4db20ad1" xlink:to="loc_snps_AnsysIncMember_019efbec-d983-7853-9067-f3288ef9dac1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_019efbec-d983-796d-9c42-77744ab33698" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-71bd-b960-a7876eacf050" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_019efbec-d983-796d-9c42-77744ab33698" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_BusinessAcquisitionExchangeRatio_019efbec-d983-7aa7-8030-c7da800f9528" xlink:href="snps-20260731.xsd#snps_BusinessAcquisitionExchangeRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-71bd-b960-a7876eacf050" xlink:to="loc_snps_BusinessAcquisitionExchangeRatio_019efbec-d983-7aa7-8030-c7da800f9528" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019efbec-d983-7dc1-a5b7-772367a11cd9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-71bd-b960-a7876eacf050" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019efbec-d983-7dc1-a5b7-772367a11cd9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/DiscontinuedOperationsDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#DiscontinuedOperationsDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/DiscontinuedOperationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019efbec-d983-78ed-8bba-b5dd6767a404" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019efbec-d983-70a0-bf57-0678fdb3c516" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019efbec-d983-78ed-8bba-b5dd6767a404" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019efbec-d983-70a0-bf57-0678fdb3c516" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019efbec-d983-76e1-a837-c2b4bff5fb53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019efbec-d983-70a0-bf57-0678fdb3c516" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019efbec-d983-76e1-a837-c2b4bff5fb53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019efbec-d983-76e1-a837-c2b4bff5fb53_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019efbec-d983-76e1-a837-c2b4bff5fb53" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019efbec-d983-76e1-a837-c2b4bff5fb53_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019efbec-d983-78b7-a9b5-434e58c8d6bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019efbec-d983-76e1-a837-c2b4bff5fb53" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019efbec-d983-78b7-a9b5-434e58c8d6bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember_019efbec-d983-7ba4-8fed-a8e2989d3ab4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019efbec-d983-78b7-a9b5-434e58c8d6bd" xlink:to="loc_us-gaap_DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember_019efbec-d983-7ba4-8fed-a8e2989d3ab4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019efbec-d983-7a9f-9dab-ffb0d005a550" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019efbec-d983-70a0-bf57-0678fdb3c516" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019efbec-d983-7a9f-9dab-ffb0d005a550" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019efbec-d983-7a9f-9dab-ffb0d005a550_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019efbec-d983-7a9f-9dab-ffb0d005a550" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019efbec-d983-7a9f-9dab-ffb0d005a550_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019efbec-d983-7e4c-b50e-5bb4494f2ad0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019efbec-d983-7a9f-9dab-ffb0d005a550" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019efbec-d983-7e4c-b50e-5bb4494f2ad0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_SoftwareIntegrityBusinessMember_019efbec-d983-7016-8e89-6ff7411b2aa9" xlink:href="snps-20260731.xsd#snps_SoftwareIntegrityBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019efbec-d983-7e4c-b50e-5bb4494f2ad0" xlink:to="loc_snps_SoftwareIntegrityBusinessMember_019efbec-d983-7016-8e89-6ff7411b2aa9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DisposalGroupIncludingDiscontinuedOperationNetAssets_019efbec-d983-7213-b8b0-e1ae78bf7bc7" xlink:href="snps-20260731.xsd#snps_DisposalGroupIncludingDiscontinuedOperationNetAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019efbec-d983-78ed-8bba-b5dd6767a404" xlink:to="loc_snps_DisposalGroupIncludingDiscontinuedOperationNetAssets_019efbec-d983-7213-b8b0-e1ae78bf7bc7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DisposalGroupIncludingDiscontinuedOperationTransactionCosts_019efbec-d983-7c70-80c8-298436a398db" xlink:href="snps-20260731.xsd#snps_DisposalGroupIncludingDiscontinuedOperationTransactionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019efbec-d983-78ed-8bba-b5dd6767a404" xlink:to="loc_snps_DisposalGroupIncludingDiscontinuedOperationTransactionCosts_019efbec-d983-7c70-80c8-298436a398db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_019efbec-d983-7169-8a27-07407ccc661f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019efbec-d983-78ed-8bba-b5dd6767a404" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_019efbec-d983-7169-8a27-07407ccc661f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DisposalGroupIncludingDiscontinuedOperationNetWorkingCapitalAdjustments_019efbec-d983-7cfc-b32c-63236c9b2613" xlink:href="snps-20260731.xsd#snps_DisposalGroupIncludingDiscontinuedOperationNetWorkingCapitalAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019efbec-d983-78ed-8bba-b5dd6767a404" xlink:to="loc_snps_DisposalGroupIncludingDiscontinuedOperationNetWorkingCapitalAdjustments_019efbec-d983-7cfc-b32c-63236c9b2613" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/AcquisitionofAnsysAdditionalInformationDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#AcquisitionofAnsysAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/AcquisitionofAnsysAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-7959-8524-e962e6e7c8f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019efbec-d983-7d01-b751-fd8e143e6047" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-7959-8524-e962e6e7c8f7" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019efbec-d983-7d01-b751-fd8e143e6047" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019efbec-d983-747b-850d-2fda8a4f971c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019efbec-d983-7d01-b751-fd8e143e6047" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019efbec-d983-747b-850d-2fda8a4f971c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019efbec-d983-747b-850d-2fda8a4f971c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019efbec-d983-747b-850d-2fda8a4f971c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019efbec-d983-747b-850d-2fda8a4f971c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019efbec-d983-7520-bf79-ad294a2ab98e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019efbec-d983-747b-850d-2fda8a4f971c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019efbec-d983-7520-bf79-ad294a2ab98e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_AnsysIncMember_019efbec-d983-77f1-95ec-21c1a7e27c6e" xlink:href="snps-20260731.xsd#snps_AnsysIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019efbec-d983-7520-bf79-ad294a2ab98e" xlink:to="loc_snps_AnsysIncMember_019efbec-d983-77f1-95ec-21c1a7e27c6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019efbec-d983-7ad2-a364-99797b81b0d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-7959-8524-e962e6e7c8f7" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019efbec-d983-7ad2-a364-99797b81b0d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019efbec-d983-7214-a027-f965079cdd24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-7959-8524-e962e6e7c8f7" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019efbec-d983-7214-a027-f965079cdd24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019efbec-d983-7ca6-8621-23f0e1b524af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-7959-8524-e962e6e7c8f7" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019efbec-d983-7ca6-8621-23f0e1b524af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019fa293-106f-7650-ac71-d93421a42c2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-7959-8524-e962e6e7c8f7" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019fa293-106f-7650-ac71-d93421a42c2c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_019fa290-91fd-7592-b968-eb5f9e54eb84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-7959-8524-e962e6e7c8f7" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_019fa290-91fd-7592-b968-eb5f9e54eb84" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019efbec-d983-727e-a1f8-298fe37acfd0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019efbec-d983-7959-8524-e962e6e7c8f7" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019efbec-d983-727e-a1f8-298fe37acfd0" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/AcquisitionofAnsysScheduleofAggregatePurchaseConsiderationandAllocationDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#AcquisitionofAnsysScheduleofAggregatePurchaseConsiderationandAllocationDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/AcquisitionofAnsysScheduleofAggregatePurchaseConsiderationandAllocationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionContingentConsiderationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable_019fa287-00b2-7059-969a-09a936188c86" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable_019fa287-00b2-7059-969a-09a936188c86" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019fa287-00b2-70cb-99b4-237fd69216b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable_019fa287-00b2-7059-969a-09a936188c86" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019fa287-00b2-70cb-99b4-237fd69216b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fa287-00b2-70cb-99b4-237fd69216b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019fa287-00b2-70cb-99b4-237fd69216b7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fa287-00b2-70cb-99b4-237fd69216b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fa287-00b2-7057-bec7-7afd23f1c836" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019fa287-00b2-70cb-99b4-237fd69216b7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fa287-00b2-7057-bec7-7afd23f1c836" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_AnsysIncMember_019fa287-00b2-7526-9262-b3c5086a0374" xlink:href="snps-20260731.xsd#snps_AnsysIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fa287-00b2-7057-bec7-7afd23f1c836" xlink:to="loc_snps_AnsysIncMember_019fa287-00b2-7526-9262-b3c5086a0374" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_019fa287-00b2-769f-ae51-8b15a0667e7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable_019fa287-00b2-7059-969a-09a936188c86" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_019fa287-00b2-769f-ae51-8b15a0667e7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019fa287-00b2-769f-ae51-8b15a0667e7c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_019fa287-00b2-769f-ae51-8b15a0667e7c" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019fa287-00b2-769f-ae51-8b15a0667e7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019fa287-00b2-7124-b625-2fe34ea2cdf6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_019fa287-00b2-769f-ae51-8b15a0667e7c" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019fa287-00b2-7124-b625-2fe34ea2cdf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019fa287-00b2-766b-9bdb-88903917c87a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019fa287-00b2-7124-b625-2fe34ea2cdf6" xlink:to="loc_us-gaap_CommonStockMember_019fa287-00b2-766b-9bdb-88903917c87a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019fa287-00b2-75d4-8503-ef1ddce990fb" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable_019fa287-00b2-7059-969a-09a936188c86" xlink:to="loc_dei_LegalEntityAxis_019fa287-00b2-75d4-8503-ef1ddce990fb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019fa287-00b2-75d4-8503-ef1ddce990fb_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019fa287-00b2-75d4-8503-ef1ddce990fb" xlink:to="loc_dei_EntityDomain_019fa287-00b2-75d4-8503-ef1ddce990fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019fa287-00b2-7a8a-80b3-9a12223af89a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019fa287-00b2-75d4-8503-ef1ddce990fb" xlink:to="loc_dei_EntityDomain_019fa287-00b2-7a8a-80b3-9a12223af89a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_AnsysIncMember_019fa287-00b2-7886-8452-3760fa2e44e1" xlink:href="snps-20260731.xsd#snps_AnsysIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019fa287-00b2-7a8a-80b3-9a12223af89a" xlink:to="loc_snps_AnsysIncMember_019fa287-00b2-7886-8452-3760fa2e44e1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019fa287-00b2-7ed0-8b73-99aa9a5361cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019fa287-00b2-7ed0-8b73-99aa9a5361cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019fa287-00b2-7e9f-8f85-7f8b55a79b77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019fa287-00b2-7e9f-8f85-7f8b55a79b77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_BusinessCombinationConsiderationTransferredStockBasedCompensationAwardsAssumed_019fa287-00b2-7394-9c63-1f55c44399a5" xlink:href="snps-20260731.xsd#snps_BusinessCombinationConsiderationTransferredStockBasedCompensationAwardsAssumed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_snps_BusinessCombinationConsiderationTransferredStockBasedCompensationAwardsAssumed_019fa287-00b2-7394-9c63-1f55c44399a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_BusinessCombinationConsiderationTransferredSettlementOfPreExistingRelationships_019fa287-00b2-7be8-97e0-1908425684cb" xlink:href="snps-20260731.xsd#snps_BusinessCombinationConsiderationTransferredSettlementOfPreExistingRelationships"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_snps_BusinessCombinationConsiderationTransferredSettlementOfPreExistingRelationships_019fa287-00b2-7be8-97e0-1908425684cb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019fa287-00b2-7947-9b3f-eb1a55076133" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019fa287-00b2-7947-9b3f-eb1a55076133" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_019fa287-00b2-7dad-a3c3-d5485a99f265" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_019fa287-00b2-7dad-a3c3-d5485a99f265" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_BusinessCombinationConsiderationTransferredNetOfCashAcquired_019fa287-00b2-7b42-891b-f2884bc43d64" xlink:href="snps-20260731.xsd#snps_BusinessCombinationConsiderationTransferredNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_snps_BusinessCombinationConsiderationTransferredNetOfCashAcquired_019fa287-00b2-7b42-891b-f2884bc43d64" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_019fa287-00b2-7a0b-a4e9-355b18d27be7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_019fa287-00b2-7a0b-a4e9-355b18d27be7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019fa287-00b2-7452-9715-91c320e861a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019fa287-00b2-7452-9715-91c320e861a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019fa287-00b2-781f-9949-73c9378548f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:to="loc_us-gaap_Goodwill_019fa287-00b2-781f-9949-73c9378548f1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019fa287-00b2-71f3-b7f9-e6c84f56ba3d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019fa287-00b2-71f3-b7f9-e6c84f56ba3d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019fa287-00b2-784c-82a4-3bb3f042da13" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019fa287-00b2-784c-82a4-3bb3f042da13" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_BusinessCombinationRecognizedLiabilityAssumedContractWithCustomerLiabilityCurrent_019fa287-00b2-7228-8677-034b7038f5d0" xlink:href="snps-20260731.xsd#snps_BusinessCombinationRecognizedLiabilityAssumedContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:to="loc_snps_BusinessCombinationRecognizedLiabilityAssumedContractWithCustomerLiabilityCurrent_019fa287-00b2-7228-8677-034b7038f5d0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_019fa287-00b2-775c-9050-21b891d508d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_019fa287-00b2-775c-9050-21b891d508d9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_BusinessCombinationRecognizedLiabilityAssumedContractWithCustomerLiabilityNoncurrent_019fa287-00b2-7741-97cc-2c2396de30f9" xlink:href="snps-20260731.xsd#snps_BusinessCombinationRecognizedLiabilityAssumedContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:to="loc_snps_BusinessCombinationRecognizedLiabilityAssumedContractWithCustomerLiabilityNoncurrent_019fa287-00b2-7741-97cc-2c2396de30f9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019fa287-00b2-7b45-9029-b00a3b35541f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019fa287-00b2-7b45-9029-b00a3b35541f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019fa287-00b2-798b-9da2-bac9e6858b73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019fa287-00b2-798b-9da2-bac9e6858b73" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019fa287-00b2-72bc-8475-1bbb33bd85f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_019fa287-00b2-734e-b5a1-d3d135b62658" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019fa287-00b2-72bc-8475-1bbb33bd85f8" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019fa287-00b2-7c5d-8c87-c76790bc152a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019fa287-00b2-7c5d-8c87-c76790bc152a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_019fa287-00b2-751f-b790-c43ffdc18cb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_019fa287-00b2-751f-b790-c43ffdc18cb4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_019fa287-00b2-7950-8dae-854b9db9706c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_019fa287-00b2-7950-8dae-854b9db9706c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_BusinessAcquisitionExchangeRatio_019fa287-00b2-7dce-b58b-d7dd4a959e7a" xlink:href="snps-20260731.xsd#snps_BusinessAcquisitionExchangeRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_snps_BusinessAcquisitionExchangeRatio_019fa287-00b2-7dce-b58b-d7dd4a959e7a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_019fa287-00b2-7a00-86d5-3e339ee726cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019fa287-00b2-7cc3-88cc-bceeecdaec7d" xlink:to="loc_us-gaap_SharePrice_019fa287-00b2-7a00-86d5-3e339ee726cf" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/AcquisitionofAnsysScheduleofEstimatedFairValueandWeightedAverageUsefulLifeoftheIntangibleAssetsDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#AcquisitionofAnsysScheduleofEstimatedFairValueandWeightedAverageUsefulLifeoftheIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/AcquisitionofAnsysScheduleofEstimatedFairValueandWeightedAverageUsefulLifeoftheIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019fa28c-0c48-78ec-a0fe-c0eac895c03a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019fa28c-0c48-7397-824f-c763129c6db9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fa28c-0c48-78ec-a0fe-c0eac895c03a" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019fa28c-0c48-7397-824f-c763129c6db9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019fa28c-0c48-7d10-b0b1-2324d3ce0ca6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019fa28c-0c48-7397-824f-c763129c6db9" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019fa28c-0c48-7d10-b0b1-2324d3ce0ca6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fa28c-0c48-7d10-b0b1-2324d3ce0ca6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019fa28c-0c48-7d10-b0b1-2324d3ce0ca6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fa28c-0c48-7d10-b0b1-2324d3ce0ca6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fa28c-0c48-7792-902b-9e4b9f8789dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019fa28c-0c48-7d10-b0b1-2324d3ce0ca6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fa28c-0c48-7792-902b-9e4b9f8789dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_AnsysIncMember_019fa28c-0c48-72af-a314-a3bf9bc0ae18" xlink:href="snps-20260731.xsd#snps_AnsysIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fa28c-0c48-7792-902b-9e4b9f8789dd" xlink:to="loc_snps_AnsysIncMember_019fa28c-0c48-72af-a314-a3bf9bc0ae18" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019fa28c-0c48-7c8b-93d7-8181b527737f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019fa28c-0c48-7397-824f-c763129c6db9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019fa28c-0c48-7c8b-93d7-8181b527737f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fa28c-0c48-7c8b-93d7-8181b527737f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019fa28c-0c48-7c8b-93d7-8181b527737f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fa28c-0c48-7c8b-93d7-8181b527737f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fa28c-0c48-75fb-ba68-131bf9cb513b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019fa28c-0c48-7c8b-93d7-8181b527737f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fa28c-0c48-75fb-ba68-131bf9cb513b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DevelopedAndCoreTechnologyMember_019fa28c-0c48-744f-a9ed-555008eb3605" xlink:href="snps-20260731.xsd#snps_DevelopedAndCoreTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fa28c-0c48-75fb-ba68-131bf9cb513b" xlink:to="loc_snps_DevelopedAndCoreTechnologyMember_019fa28c-0c48-744f-a9ed-555008eb3605" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019fa28c-0c48-7dda-97f5-bd576a075ca1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fa28c-0c48-75fb-ba68-131bf9cb513b" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019fa28c-0c48-7dda-97f5-bd576a075ca1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualRightsMember_019fa28c-0c48-7233-bb78-cd1bf7cda4f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractualRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fa28c-0c48-75fb-ba68-131bf9cb513b" xlink:to="loc_us-gaap_ContractualRightsMember_019fa28c-0c48-7233-bb78-cd1bf7cda4f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_019fa28c-0c48-77cb-b199-cca49726f24c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fa28c-0c48-75fb-ba68-131bf9cb513b" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_019fa28c-0c48-77cb-b199-cca49726f24c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019fa28c-0c48-7231-a4d7-b38502af7996" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019fa28c-0c48-7397-824f-c763129c6db9" xlink:to="loc_srt_RangeAxis_019fa28c-0c48-7231-a4d7-b38502af7996" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019fa28c-0c48-7231-a4d7-b38502af7996_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019fa28c-0c48-7231-a4d7-b38502af7996" xlink:to="loc_srt_RangeMember_019fa28c-0c48-7231-a4d7-b38502af7996_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019fa28c-0c48-7af5-8c2d-1d4c42e61dbc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019fa28c-0c48-7231-a4d7-b38502af7996" xlink:to="loc_srt_RangeMember_019fa28c-0c48-7af5-8c2d-1d4c42e61dbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019fa28c-0c48-7da9-ab87-38d00bb31c55" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019fa28c-0c48-7af5-8c2d-1d4c42e61dbc" xlink:to="loc_srt_MinimumMember_019fa28c-0c48-7da9-ab87-38d00bb31c55" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019fa28c-0c48-74a6-9ea3-5f067eea3ad3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019fa28c-0c48-7af5-8c2d-1d4c42e61dbc" xlink:to="loc_srt_MaximumMember_019fa28c-0c48-74a6-9ea3-5f067eea3ad3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_019fa28c-0c48-72a4-a1e2-66742d1d5da8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fa28c-0c48-78ec-a0fe-c0eac895c03a" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_019fa28c-0c48-72a4-a1e2-66742d1d5da8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019fa28c-0c48-77d1-aadb-9080e21472aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fa28c-0c48-78ec-a0fe-c0eac895c03a" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019fa28c-0c48-77d1-aadb-9080e21472aa" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/RevenueScheduleofDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#RevenueScheduleofDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/RevenueScheduleofDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019efbec-d983-7666-9f6b-3e63cecda468" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019efbec-d983-795f-9337-5803cd8183e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019efbec-d983-7666-9f6b-3e63cecda468" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019efbec-d983-795f-9337-5803cd8183e3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019efbec-d983-7f85-8a5d-9511a8eb442e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019efbec-d983-795f-9337-5803cd8183e3" xlink:to="loc_srt_ProductOrServiceAxis_019efbec-d983-7f85-8a5d-9511a8eb442e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019efbec-d983-7f85-8a5d-9511a8eb442e_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019efbec-d983-7f85-8a5d-9511a8eb442e" xlink:to="loc_srt_ProductsAndServicesDomain_019efbec-d983-7f85-8a5d-9511a8eb442e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019efbec-d983-7214-9d15-e7f1e184c12b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019efbec-d983-7f85-8a5d-9511a8eb442e" xlink:to="loc_srt_ProductsAndServicesDomain_019efbec-d983-7214-9d15-e7f1e184c12b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_ElectronicDesignAutomationMember_019efbec-d983-7595-867f-a84c38a6f18c" xlink:href="snps-20260731.xsd#snps_ElectronicDesignAutomationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019efbec-d983-7214-9d15-e7f1e184c12b" xlink:to="loc_snps_ElectronicDesignAutomationMember_019efbec-d983-7595-867f-a84c38a6f18c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DesignIPProductGroupMember_019efbec-d983-7d92-86ad-29fe1983023d" xlink:href="snps-20260731.xsd#snps_DesignIPProductGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019efbec-d983-7214-9d15-e7f1e184c12b" xlink:to="loc_snps_DesignIPProductGroupMember_019efbec-d983-7d92-86ad-29fe1983023d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_AnsysProductGroupMember_019efbec-d983-7123-b79c-a228104f59e5" xlink:href="snps-20260731.xsd#snps_AnsysProductGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019efbec-d983-7214-9d15-e7f1e184c12b" xlink:to="loc_snps_AnsysProductGroupMember_019efbec-d983-7123-b79c-a228104f59e5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductAndServiceOtherMember_019efbec-d983-7fa9-a2bc-856c26924802" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductAndServiceOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019efbec-d983-7214-9d15-e7f1e184c12b" xlink:to="loc_us-gaap_ProductAndServiceOtherMember_019efbec-d983-7fa9-a2bc-856c26924802" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019efbec-d983-7a97-a728-1a48f12ae3da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019efbec-d983-795f-9337-5803cd8183e3" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019efbec-d983-7a97-a728-1a48f12ae3da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019efbec-d983-7a97-a728-1a48f12ae3da_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019efbec-d983-7a97-a728-1a48f12ae3da" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019efbec-d983-7a97-a728-1a48f12ae3da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019efbec-d983-7b77-8fbc-4646ffadf7ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019efbec-d983-7a97-a728-1a48f12ae3da" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019efbec-d983-7b77-8fbc-4646ffadf7ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductConcentrationRiskMember_019efbec-d983-72b0-b88f-6f83a093fe15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019efbec-d983-7b77-8fbc-4646ffadf7ae" xlink:to="loc_us-gaap_ProductConcentrationRiskMember_019efbec-d983-72b0-b88f-6f83a093fe15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019efbec-d983-7e9f-93f7-d6d5348f641e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019efbec-d983-795f-9337-5803cd8183e3" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019efbec-d983-7e9f-93f7-d6d5348f641e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019efbec-d983-7e9f-93f7-d6d5348f641e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019efbec-d983-7e9f-93f7-d6d5348f641e" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019efbec-d983-7e9f-93f7-d6d5348f641e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019efbec-d983-701a-890b-31f5faa15114" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019efbec-d983-7e9f-93f7-d6d5348f641e" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019efbec-d983-701a-890b-31f5faa15114" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_019efbec-d983-7b52-8021-7a1aadabbfe5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019efbec-d983-701a-890b-31f5faa15114" xlink:to="loc_us-gaap_SalesRevenueNetMember_019efbec-d983-7b52-8021-7a1aadabbfe5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019efbec-d983-731c-b219-d34365860e5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019efbec-d983-7666-9f6b-3e63cecda468" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019efbec-d983-731c-b219-d34365860e5a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/RevenueAdditionalInformationDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#RevenueAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/RevenueAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019efbec-d983-7e0d-b9c2-7b7ce90fc87f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019efbec-d983-7e0d-b9c2-7b7ce90fc87f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019efbec-d983-7574-9812-a1b7fd635990" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019efbec-d983-7e0d-b9c2-7b7ce90fc87f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019efbec-d983-7574-9812-a1b7fd635990" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019efbec-d983-706a-b41f-18a1e74ea83b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019efbec-d983-7e0d-b9c2-7b7ce90fc87f" xlink:to="loc_srt_ProductOrServiceAxis_019efbec-d983-706a-b41f-18a1e74ea83b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019efbec-d983-706a-b41f-18a1e74ea83b_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019efbec-d983-706a-b41f-18a1e74ea83b" xlink:to="loc_srt_ProductsAndServicesDomain_019efbec-d983-706a-b41f-18a1e74ea83b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019efbec-d983-7d34-886d-348aeb8766d5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019efbec-d983-706a-b41f-18a1e74ea83b" xlink:to="loc_srt_ProductsAndServicesDomain_019efbec-d983-7d34-886d-348aeb8766d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_SalesBasedRoyaltiesMember_019efbec-d983-74c4-a5f6-64ab0b8c5051" xlink:href="snps-20260731.xsd#snps_SalesBasedRoyaltiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019efbec-d983-7d34-886d-348aeb8766d5" xlink:to="loc_snps_SalesBasedRoyaltiesMember_019efbec-d983-74c4-a5f6-64ab0b8c5051" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_019efbec-d983-7c4e-8f24-0a0b626e8628" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerAssetNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_019efbec-d983-7c4e-8f24-0a0b626e8628" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019efbec-d983-7f52-bfe1-62eccc8fc226" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019efbec-d983-7f52-bfe1-62eccc8fc226" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019efbec-d983-7135-8031-bd816f763fdf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019efbec-d983-7135-8031-bd816f763fdf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_RevenueRemainingPerformanceObligationNonCancellableAmount_019efbec-d983-7b82-8890-63c1dedc2fe6" xlink:href="snps-20260731.xsd#snps_RevenueRemainingPerformanceObligationNonCancellableAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_snps_RevenueRemainingPerformanceObligationNonCancellableAmount_019efbec-d983-7b82-8890-63c1dedc2fe6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019efbec-d983-7b80-abf0-ccdb329c0751" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019efbec-d983-7b80-abf0-ccdb329c0751" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019efbec-d983-7cb0-b077-da53c09701a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019efbec-d983-7cb0-b077-da53c09701a2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_019efbec-d983-711a-a410-1f29285c4063" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_CapitalizedContractCostNet_019efbec-d983-711a-a410-1f29285c4063" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetCurrent_019efbec-d983-788a-b911-bdfdda563e40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_CapitalizedContractCostNetCurrent_019efbec-d983-788a-b911-bdfdda563e40" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_019efbec-d983-78e4-9af2-c9191d226a14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_CapitalizedContractCostNetNoncurrent_019efbec-d983-78e4-9af2-c9191d226a14" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_019efbec-d983-78dd-bdfc-56424ba24d43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_019efbec-d983-78dd-bdfc-56424ba24d43" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/RevenueAdditionalInformationDetails_1" xlink:type="simple" xlink:href="snps-20260731.xsd#RevenueAdditionalInformationDetails_1"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/RevenueAdditionalInformationDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019efbec-d983-7e0d-b9c2-7b7ce90fc87f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019efbec-d983-7e0d-b9c2-7b7ce90fc87f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019efbec-d983-706a-b41f-18a1e74ea83b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019efbec-d983-7e0d-b9c2-7b7ce90fc87f" xlink:to="loc_srt_ProductOrServiceAxis_019efbec-d983-706a-b41f-18a1e74ea83b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019efbec-d983-706a-b41f-18a1e74ea83b_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019efbec-d983-706a-b41f-18a1e74ea83b" xlink:to="loc_srt_ProductsAndServicesDomain_019efbec-d983-706a-b41f-18a1e74ea83b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019efbec-d983-7d34-886d-348aeb8766d5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019efbec-d983-706a-b41f-18a1e74ea83b" xlink:to="loc_srt_ProductsAndServicesDomain_019efbec-d983-7d34-886d-348aeb8766d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_SalesBasedRoyaltiesMember_019efbec-d983-74c4-a5f6-64ab0b8c5051" xlink:href="snps-20260731.xsd#snps_SalesBasedRoyaltiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019efbec-d983-7d34-886d-348aeb8766d5" xlink:to="loc_snps_SalesBasedRoyaltiesMember_019efbec-d983-74c4-a5f6-64ab0b8c5051" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_019efbec-d983-7c4e-8f24-0a0b626e8628" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerAssetNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_019efbec-d983-7c4e-8f24-0a0b626e8628" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019efbec-d983-7f52-bfe1-62eccc8fc226" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019efbec-d983-7f52-bfe1-62eccc8fc226" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019efbec-d983-7135-8031-bd816f763fdf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019efbec-d983-7135-8031-bd816f763fdf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_RevenueRemainingPerformanceObligationNonCancellableAmount_019efbec-d983-7b82-8890-63c1dedc2fe6" xlink:href="snps-20260731.xsd#snps_RevenueRemainingPerformanceObligationNonCancellableAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_snps_RevenueRemainingPerformanceObligationNonCancellableAmount_019efbec-d983-7b82-8890-63c1dedc2fe6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019efbec-d983-7b80-abf0-ccdb329c0751" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019efbec-d983-7b80-abf0-ccdb329c0751" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019efbec-d983-7cb0-b077-da53c09701a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019efbec-d983-7cb0-b077-da53c09701a2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_019efbec-d983-711a-a410-1f29285c4063" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_CapitalizedContractCostNet_019efbec-d983-711a-a410-1f29285c4063" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetCurrent_019efbec-d983-788a-b911-bdfdda563e40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_CapitalizedContractCostNetCurrent_019efbec-d983-788a-b911-bdfdda563e40" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_019efbec-d983-78e4-9af2-c9191d226a14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_CapitalizedContractCostNetNoncurrent_019efbec-d983-78e4-9af2-c9191d226a14" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_019efbec-d983-78dd-bdfc-56424ba24d43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019efbec-d983-7329-b920-02a5e0d2a40b" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_019efbec-d983-78dd-bdfc-56424ba24d43" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/GoodwillandIntangibleAssetsScheduleofIntangibleAssetsDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#GoodwillandIntangibleAssetsScheduleofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/GoodwillandIntangibleAssetsScheduleofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019efbec-d983-7fe5-9ffe-71be21454075" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019efbec-d983-74be-828c-990c8e84b2b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019efbec-d983-7fe5-9ffe-71be21454075" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019efbec-d983-74be-828c-990c8e84b2b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019efbec-d983-7ede-a82a-4ad9048eae5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019efbec-d983-74be-828c-990c8e84b2b4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019efbec-d983-7ede-a82a-4ad9048eae5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-7ede-a82a-4ad9048eae5b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019efbec-d983-7ede-a82a-4ad9048eae5b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-7ede-a82a-4ad9048eae5b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-72e0-adc8-fa7419adae5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019efbec-d983-7ede-a82a-4ad9048eae5b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-72e0-adc8-fa7419adae5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DevelopedAndCoreTechnologyMember_019efbec-d983-7259-a2e9-9e7d95b7cd00" xlink:href="snps-20260731.xsd#snps_DevelopedAndCoreTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-72e0-adc8-fa7419adae5f" xlink:to="loc_snps_DevelopedAndCoreTechnologyMember_019efbec-d983-7259-a2e9-9e7d95b7cd00" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019efbec-d983-7f74-8177-d90e8750fab3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-72e0-adc8-fa7419adae5f" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019efbec-d983-7f74-8177-d90e8750fab3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualRightsMember_019efbec-d983-742e-9332-c6803fcf0d61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractualRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-72e0-adc8-fa7419adae5f" xlink:to="loc_us-gaap_ContractualRightsMember_019efbec-d983-742e-9332-c6803fcf0d61" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_019efbec-d983-71f3-9ef2-3b7488e8bffa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-72e0-adc8-fa7419adae5f" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_019efbec-d983-71f3-9ef2-3b7488e8bffa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019efbec-d983-7ed3-9c71-201db2b9b0da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019efbec-d983-7fe5-9ffe-71be21454075" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019efbec-d983-7ed3-9c71-201db2b9b0da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019efbec-d983-795e-a14d-cd09c95569be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019efbec-d983-7fe5-9ffe-71be21454075" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019efbec-d983-795e-a14d-cd09c95569be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019efbec-d983-79da-8f79-7ae87ea60120" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019efbec-d983-7fe5-9ffe-71be21454075" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019efbec-d983-79da-8f79-7ae87ea60120" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/GoodwillandIntangibleAssetsScheduleofAmortizationExpenseRelatedtoIntangibleAssetsDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#GoodwillandIntangibleAssetsScheduleofAmortizationExpenseRelatedtoIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/GoodwillandIntangibleAssetsScheduleofAmortizationExpenseRelatedtoIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_snps_FiniteLivedIntangibleAssetsAmortizationExpenseLineItems_019efbec-d983-7641-b5e3-568c529fce21" xlink:href="snps-20260731.xsd#snps_FiniteLivedIntangibleAssetsAmortizationExpenseLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_FiniteLivedIntangibleAssetsAmortizationExpenseTable_019efbec-d983-7342-a88f-43a9d25fd1f5" xlink:href="snps-20260731.xsd#snps_FiniteLivedIntangibleAssetsAmortizationExpenseTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_snps_FiniteLivedIntangibleAssetsAmortizationExpenseLineItems_019efbec-d983-7641-b5e3-568c529fce21" xlink:to="loc_snps_FiniteLivedIntangibleAssetsAmortizationExpenseTable_019efbec-d983-7342-a88f-43a9d25fd1f5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019efbec-d983-785c-9120-6b3d6b8d43cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FiniteLivedIntangibleAssetsAmortizationExpenseTable_019efbec-d983-7342-a88f-43a9d25fd1f5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019efbec-d983-785c-9120-6b3d6b8d43cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-785c-9120-6b3d6b8d43cb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019efbec-d983-785c-9120-6b3d6b8d43cb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-785c-9120-6b3d6b8d43cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-7d11-bfbe-286e42f5e130" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019efbec-d983-785c-9120-6b3d6b8d43cb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-7d11-bfbe-286e42f5e130" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DevelopedAndCoreTechnologyMember_019efbec-d983-7515-ba53-d217ace32779" xlink:href="snps-20260731.xsd#snps_DevelopedAndCoreTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-7d11-bfbe-286e42f5e130" xlink:to="loc_snps_DevelopedAndCoreTechnologyMember_019efbec-d983-7515-ba53-d217ace32779" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019efbec-d983-7255-bb6f-890c24417d8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-7d11-bfbe-286e42f5e130" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019efbec-d983-7255-bb6f-890c24417d8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualRightsMember_019efbec-d983-7d9c-9cca-f242ce62213b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractualRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-7d11-bfbe-286e42f5e130" xlink:to="loc_us-gaap_ContractualRightsMember_019efbec-d983-7d9c-9cca-f242ce62213b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_019efbec-d983-7616-a8cb-bf1c71144866" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019efbec-d983-7d11-bfbe-286e42f5e130" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_019efbec-d983-7616-a8cb-bf1c71144866" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_AmortizationOfIntangibleAssetsAndCostAmortization_019efbec-d983-7baa-852f-8e774b752f2c" xlink:href="snps-20260731.xsd#snps_AmortizationOfIntangibleAssetsAndCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FiniteLivedIntangibleAssetsAmortizationExpenseLineItems_019efbec-d983-7641-b5e3-568c529fce21" xlink:to="loc_snps_AmortizationOfIntangibleAssetsAndCostAmortization_019efbec-d983-7baa-852f-8e774b752f2c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/BalanceSheetComponentsAdditionalInformationDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#BalanceSheetComponentsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/BalanceSheetComponentsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019f21dc-778a-7b59-87a1-c11ec9dbf6ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019f21dc-778a-79e2-9720-0b26c81722da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019f21dc-778a-7b59-87a1-c11ec9dbf6ad" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019f21dc-778a-79e2-9720-0b26c81722da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019f21dc-778a-7b98-805a-c171ad28571c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019f21dc-778a-79e2-9720-0b26c81722da" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019f21dc-778a-7b98-805a-c171ad28571c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019f21dc-778a-7b98-805a-c171ad28571c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019f21dc-778a-7b98-805a-c171ad28571c" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019f21dc-778a-7b98-805a-c171ad28571c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019f21dc-778a-7da1-91ea-e98bda637b41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019f21dc-778a-7b98-805a-c171ad28571c" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019f21dc-778a-7da1-91ea-e98bda637b41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_ProcessorIPMember_019f21dc-e0ae-71c6-98e5-6a569680c89c" xlink:href="snps-20260731.xsd#snps_ProcessorIPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019f21dc-778a-7da1-91ea-e98bda637b41" xlink:to="loc_snps_ProcessorIPMember_019f21dc-e0ae-71c6-98e5-6a569680c89c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019f21e9-14c3-783d-86f1-b3a8c8ee29aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019f21dc-778a-79e2-9720-0b26c81722da" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019f21e9-14c3-783d-86f1-b3a8c8ee29aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019f21e9-14c3-783d-86f1-b3a8c8ee29aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019f21e9-14c3-783d-86f1-b3a8c8ee29aa" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019f21e9-14c3-783d-86f1-b3a8c8ee29aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019f21e9-14c3-7dbe-9ccf-6c01f34739f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019f21e9-14c3-783d-86f1-b3a8c8ee29aa" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019f21e9-14c3-7dbe-9ccf-6c01f34739f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_019f21e9-adf5-7e8f-b691-6a629b65abc5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019f21e9-14c3-7dbe-9ccf-6c01f34739f3" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_019f21e9-adf5-7e8f-b691-6a629b65abc5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_019f21ec-174c-7e47-8ac7-c30c69354671" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019f21dc-778a-7b59-87a1-c11ec9dbf6ad" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_019f21ec-174c-7e47-8ac7-c30c69354671" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DisposalGroupIncludingDiscontinuedOperationNetAssetsCurrent_019f21de-0d55-76a2-a68c-9bbfc655d019" xlink:href="snps-20260731.xsd#snps_DisposalGroupIncludingDiscontinuedOperationNetAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019f21dc-778a-7b59-87a1-c11ec9dbf6ad" xlink:to="loc_snps_DisposalGroupIncludingDiscontinuedOperationNetAssetsCurrent_019f21de-0d55-76a2-a68c-9bbfc655d019" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillCurrent_019f21de-80a3-7572-944a-ceea353acf81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019f21dc-778a-7b59-87a1-c11ec9dbf6ad" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillCurrent_019f21de-80a3-7572-944a-ceea353acf81" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_01a011b8-3ef4-774d-9d6a-fc8498b83aa0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019f21dc-778a-7b59-87a1-c11ec9dbf6ad" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_01a011b8-3ef4-774d-9d6a-fc8498b83aa0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DisposalGroupIncludingDiscontinuedOperationsDisposalCosts_019fa555-298f-7f86-a91c-23c792f6c190" xlink:href="snps-20260731.xsd#snps_DisposalGroupIncludingDiscontinuedOperationsDisposalCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019f21dc-778a-7b59-87a1-c11ec9dbf6ad" xlink:to="loc_snps_DisposalGroupIncludingDiscontinuedOperationsDisposalCosts_019fa555-298f-7f86-a91c-23c792f6c190" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_01a011b7-2ade-76be-af31-e4dd3446489d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019f21dc-778a-7b59-87a1-c11ec9dbf6ad" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_01a011b7-2ade-76be-af31-e4dd3446489d" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesScheduleofCashEquivalentsandShortTermInvestmentsDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#FinancialAssetsandLiabilitiesScheduleofCashEquivalentsandShortTermInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesScheduleofCashEquivalentsandShortTermInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019efbec-d984-78b5-9cb8-014be9899261" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019efbec-d984-7af1-9979-5f5a641c395c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019efbec-d984-78b5-9cb8-014be9899261" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019efbec-d984-7af1-9979-5f5a641c395c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_019efbec-d984-7c1c-8b16-a902ac3f06ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019efbec-d984-7af1-9979-5f5a641c395c" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_019efbec-d984-7c1c-8b16-a902ac3f06ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019efbec-d984-7c1c-8b16-a902ac3f06ab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019efbec-d984-7c1c-8b16-a902ac3f06ab" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019efbec-d984-7c1c-8b16-a902ac3f06ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019efbec-d984-7d80-b585-d2ec51a5bcc1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019efbec-d984-7c1c-8b16-a902ac3f06ab" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019efbec-d984-7d80-b585-d2ec51a5bcc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_019efbec-d984-72c9-a9e0-1a6565f2bc5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019efbec-d984-7d80-b585-d2ec51a5bcc1" xlink:to="loc_us-gaap_MoneyMarketFundsMember_019efbec-d984-72c9-a9e0-1a6565f2bc5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019efbec-d984-7c92-820b-091a035cacb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019efbec-d984-7d80-b585-d2ec51a5bcc1" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019efbec-d984-7c92-820b-091a035cacb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019efbec-d984-73a9-ad6f-465ba48cf984" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019efbec-d984-7af1-9979-5f5a641c395c" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019efbec-d984-73a9-ad6f-465ba48cf984" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-73a9-ad6f-465ba48cf984_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019efbec-d984-73a9-ad6f-465ba48cf984" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-73a9-ad6f-465ba48cf984_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-7b40-8cac-0dfb11bf9a36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019efbec-d984-73a9-ad6f-465ba48cf984" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-7b40-8cac-0dfb11bf9a36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019efbec-d984-75fb-8cdf-958c28efba5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-7b40-8cac-0dfb11bf9a36" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019efbec-d984-75fb-8cdf-958c28efba5d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_019efbec-d984-78f5-ab63-92ce0f4701c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-7b40-8cac-0dfb11bf9a36" xlink:to="loc_us-gaap_MunicipalBondsMember_019efbec-d984-78f5-ab63-92ce0f4701c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019efbec-d984-74fc-8de9-1747917e27a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-7b40-8cac-0dfb11bf9a36" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019efbec-d984-74fc-8de9-1747917e27a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_019efbf1-f00c-7064-82f1-70cb9c1e5974" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-7b40-8cac-0dfb11bf9a36" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_019efbf1-f00c-7064-82f1-70cb9c1e5974" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashEquivalentsAtCarryingValue_019efbec-d984-7e28-8e81-ff15f1752c4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019efbec-d984-78b5-9cb8-014be9899261" xlink:to="loc_us-gaap_CashEquivalentsAtCarryingValue_019efbec-d984-7e28-8e81-ff15f1752c4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019efbec-d984-7930-a173-d08a5552a156" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019efbec-d984-78b5-9cb8-014be9899261" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019efbec-d984-7930-a173-d08a5552a156" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019efbec-d984-7144-bc4d-60b90a53da8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019efbec-d984-78b5-9cb8-014be9899261" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019efbec-d984-7144-bc4d-60b90a53da8c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019efbec-d984-7fb1-ae59-0b7e69605718" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019efbec-d984-78b5-9cb8-014be9899261" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019efbec-d984-7fb1-ae59-0b7e69605718" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019efbec-d984-78e4-a9ca-54c5ab72c13e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019efbec-d984-78b5-9cb8-014be9899261" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019efbec-d984-78e4-a9ca-54c5ab72c13e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019efbec-d984-7726-9795-10eb32b7ee0a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019efbec-d984-78b5-9cb8-014be9899261" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019efbec-d984-7726-9795-10eb32b7ee0a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019efbec-d984-7d75-8d4d-7309306798ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019efbec-d984-78b5-9cb8-014be9899261" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019efbec-d984-7d75-8d4d-7309306798ec" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesAdditionalInformationDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#FinancialAssetsandLiabilitiesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:href="snps-20260731.xsd#snps_FinancialAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7586-a762-942016444400" xlink:href="snps-20260731.xsd#snps_FinancialAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7586-a762-942016444400" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-7a2a-851c-2b17a8074562" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7586-a762-942016444400" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-7a2a-851c-2b17a8074562" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7a2a-851c-2b17a8074562_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-7a2a-851c-2b17a8074562" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7a2a-851c-2b17a8074562_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7732-97fe-e77a960f3389" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-7a2a-851c-2b17a8074562" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7732-97fe-e77a960f3389" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-7914-81da-518d215b9bad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7732-97fe-e77a960f3389" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-7914-81da-518d215b9bad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019efbec-d984-7489-b06c-533bbfe1db12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7732-97fe-e77a960f3389" xlink:to="loc_us-gaap_InterestRateContractMember_019efbec-d984-7489-b06c-533bbfe1db12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_InterestRateContractSettledMember_019efbec-d984-784a-8cd0-453b5b923f34" xlink:href="snps-20260731.xsd#snps_InterestRateContractSettledMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateContractMember_019efbec-d984-7489-b06c-533bbfe1db12" xlink:to="loc_snps_InterestRateContractSettledMember_019efbec-d984-784a-8cd0-453b5b923f34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_ForeignExchangeForwardNonFunctionalCurrencyMember_019efbec-d984-71b6-a012-3ccc031411c4" xlink:href="snps-20260731.xsd#snps_ForeignExchangeForwardNonFunctionalCurrencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7732-97fe-e77a960f3389" xlink:to="loc_snps_ForeignExchangeForwardNonFunctionalCurrencyMember_019efbec-d984-71b6-a012-3ccc031411c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_ForeignCurrencyHedgeInternationalRevenuesAndExpensesMember_019efbec-d984-79ec-8fca-f91b8f2b1dce" xlink:href="snps-20260731.xsd#snps_ForeignCurrencyHedgeInternationalRevenuesAndExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7732-97fe-e77a960f3389" xlink:to="loc_snps_ForeignCurrencyHedgeInternationalRevenuesAndExpensesMember_019efbec-d984-79ec-8fca-f91b8f2b1dce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019efbec-d984-76a3-b70c-9606183803ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7586-a762-942016444400" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019efbec-d984-76a3-b70c-9606183803ad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019efbec-d984-76a3-b70c-9606183803ad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019efbec-d984-76a3-b70c-9606183803ad" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019efbec-d984-76a3-b70c-9606183803ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019efbec-d984-7e4d-94d5-b423d93199c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019efbec-d984-76a3-b70c-9606183803ad" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019efbec-d984-7e4d-94d5-b423d93199c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019efbec-d984-76f0-8143-c99abf40297e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019efbec-d984-7e4d-94d5-b423d93199c4" xlink:to="loc_us-gaap_CashFlowHedgingMember_019efbec-d984-76f0-8143-c99abf40297e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019efbec-d984-75b3-8b30-8daada3f38db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7586-a762-942016444400" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019efbec-d984-75b3-8b30-8daada3f38db" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019efbec-d984-75b3-8b30-8daada3f38db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019efbec-d984-75b3-8b30-8daada3f38db" xlink:to="loc_us-gaap_EquityComponentDomain_019efbec-d984-75b3-8b30-8daada3f38db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019efbec-d984-7575-afe9-ee364eb7f746" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019efbec-d984-75b3-8b30-8daada3f38db" xlink:to="loc_us-gaap_EquityComponentDomain_019efbec-d984-7575-afe9-ee364eb7f746" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember_019efbec-d984-7f98-9906-574fbfce266d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019efbec-d984-7575-afe9-ee364eb7f746" xlink:to="loc_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember_019efbec-d984-7f98-9906-574fbfce266d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019efbec-d984-77c5-b224-a8ca6bea1228" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7586-a762-942016444400" xlink:to="loc_us-gaap_HedgingDesignationAxis_019efbec-d984-77c5-b224-a8ca6bea1228" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-77c5-b224-a8ca6bea1228_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019efbec-d984-77c5-b224-a8ca6bea1228" xlink:to="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-77c5-b224-a8ca6bea1228_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-7cbb-b345-7e094a493783" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019efbec-d984-77c5-b224-a8ca6bea1228" xlink:to="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-7cbb-b345-7e094a493783" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019efbec-d984-7e41-9f44-83ecf1011af9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-7cbb-b345-7e094a493783" xlink:to="loc_us-gaap_NondesignatedMember_019efbec-d984-7e41-9f44-83ecf1011af9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount_019efbec-d984-77db-80d8-be7f1319ce46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount_019efbec-d984-77db-80d8-be7f1319ce46" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DerivativeMaximumShipmentPeriodForEntryIntoForeignCurrencyForwardContract_019efbec-d984-745e-b110-b802bf09dc64" xlink:href="snps-20260731.xsd#snps_DerivativeMaximumShipmentPeriodForEntryIntoForeignCurrencyForwardContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_snps_DerivativeMaximumShipmentPeriodForEntryIntoForeignCurrencyForwardContract_019efbec-d984-745e-b110-b802bf09dc64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTermOfContract_019efbec-d984-7064-b580-e74b8d0a09cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_us-gaap_DerivativeTermOfContract_019efbec-d984-7064-b580-e74b8d0a09cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DerivativeExposurePeriod_019efbec-d984-7213-a677-e2b70bc05d56" xlink:href="snps-20260731.xsd#snps_DerivativeExposurePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_snps_DerivativeExposurePeriod_019efbec-d984-7213-a677-e2b70bc05d56" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimateOfTimeToTransfer1_019efbec-d984-73ee-802f-88216f44f277" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimateOfTimeToTransfer1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimateOfTimeToTransfer1_019efbec-d984-73ee-802f-88216f44f277" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DerivativeInstrumentsGainLossRelatedToDiscontinuingOfCashFlowHedge_019efbec-d984-74e2-8c77-aca753c716a9" xlink:href="snps-20260731.xsd#snps_DerivativeInstrumentsGainLossRelatedToDiscontinuingOfCashFlowHedge"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_snps_DerivativeInstrumentsGainLossRelatedToDiscontinuingOfCashFlowHedge_019efbec-d984-74e2-8c77-aca753c716a9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019efbec-d984-703a-9742-1ba83f444681" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019efbec-d984-703a-9742-1ba83f444681" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019efbec-d984-7764-99df-df6b8122452a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019efbec-d984-7764-99df-df6b8122452a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_019efbec-d984-7307-b091-0af92a2c6280" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_019efbec-d984-7307-b091-0af92a2c6280" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019efbec-d984-781f-b523-ae0906998195" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019efbec-d984-781f-b523-ae0906998195" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019efbec-d984-789b-bf97-02fc1c7f7f12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_us-gaap_DebtInstrumentTerm_019efbec-d984-789b-bf97-02fc1c7f7f12" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019efbec-d984-792f-b971-adacba24743a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019efbec-d984-792f-b971-adacba24743a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaximumLengthOfTimeForeignCurrencyCashFlowHedge_019efbec-d984-7747-b639-1c32c932e884" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MaximumLengthOfTimeForeignCurrencyCashFlowHedge"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_us-gaap_MaximumLengthOfTimeForeignCurrencyCashFlowHedge_019efbec-d984-7747-b639-1c32c932e884" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeRemainingMaturity1_019efbec-d984-798a-8896-fb0ea0142504" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeRemainingMaturity1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-7262-9d50-f592014aadc1" xlink:to="loc_us-gaap_DerivativeRemainingMaturity1_019efbec-d984-798a-8896-fb0ea0142504" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesScheduleofNotionalAmountsofForeignCurrencyDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#FinancialAssetsandLiabilitiesScheduleofNotionalAmountsofForeignCurrencyDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesScheduleofNotionalAmountsofForeignCurrencyDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019efbec-d984-7920-9c77-fea1284c11b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019efbec-d984-7ff7-a69c-eaa74e23b9a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019efbec-d984-7920-9c77-fea1284c11b5" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019efbec-d984-7ff7-a69c-eaa74e23b9a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-728b-b362-e1ba201f5d17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019efbec-d984-7ff7-a69c-eaa74e23b9a7" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-728b-b362-e1ba201f5d17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-728b-b362-e1ba201f5d17_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-728b-b362-e1ba201f5d17" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-728b-b362-e1ba201f5d17_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7c79-a49e-420b8902ac91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-728b-b362-e1ba201f5d17" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7c79-a49e-420b8902ac91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-7a70-b37f-35748d0d6c69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7c79-a49e-420b8902ac91" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-7a70-b37f-35748d0d6c69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019efbec-d984-7200-b0c6-ca24a3837a9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019efbec-d984-7920-9c77-fea1284c11b5" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019efbec-d984-7200-b0c6-ca24a3837a9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_019efbec-d984-7742-abed-4b33f0bc6a42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019efbec-d984-7920-9c77-fea1284c11b5" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_019efbec-d984-7742-abed-4b33f0bc6a42" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesScheduleofFairValuesofForeignCurrencyDerivativeInstrumentDesignatedandNonDesignatedasHedgingInstrumentsinBalanceSheetDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#FinancialAssetsandLiabilitiesScheduleofFairValuesofForeignCurrencyDerivativeInstrumentDesignatedandNonDesignatedasHedgingInstrumentsinBalanceSheetDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesScheduleofFairValuesofForeignCurrencyDerivativeInstrumentDesignatedandNonDesignatedasHedgingInstrumentsinBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-78c3-a532-9daaf8f9eaf2" xlink:href="snps-20260731.xsd#snps_FinancialAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7228-a80f-611a0afa8621" xlink:href="snps-20260731.xsd#snps_FinancialAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-78c3-a532-9daaf8f9eaf2" xlink:to="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7228-a80f-611a0afa8621" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019efbec-d984-7e1d-9354-39e89310c70a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7228-a80f-611a0afa8621" xlink:to="loc_us-gaap_HedgingDesignationAxis_019efbec-d984-7e1d-9354-39e89310c70a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-7e1d-9354-39e89310c70a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019efbec-d984-7e1d-9354-39e89310c70a" xlink:to="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-7e1d-9354-39e89310c70a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-76e9-93da-b9049827ffd6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019efbec-d984-7e1d-9354-39e89310c70a" xlink:to="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-76e9-93da-b9049827ffd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019efbec-d984-7ba6-9356-6f992642a640" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-76e9-93da-b9049827ffd6" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019efbec-d984-7ba6-9356-6f992642a640" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019efbec-d984-7901-be5f-136998bd0b14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-76e9-93da-b9049827ffd6" xlink:to="loc_us-gaap_NondesignatedMember_019efbec-d984-7901-be5f-136998bd0b14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionLocationBalanceAxis_019efbec-d984-768a-8bf8-3f67e91333a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfFinancialPositionLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7228-a80f-611a0afa8621" xlink:to="loc_us-gaap_StatementOfFinancialPositionLocationBalanceAxis_019efbec-d984-768a-8bf8-3f67e91333a3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-74a3-9074-11f9bfa665c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7228-a80f-611a0afa8621" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-74a3-9074-11f9bfa665c5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-74a3-9074-11f9bfa665c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-74a3-9074-11f9bfa665c5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-74a3-9074-11f9bfa665c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7941-acce-20c20f73f9d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-74a3-9074-11f9bfa665c5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7941-acce-20c20f73f9d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-788b-9994-3cd2667cd5d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7941-acce-20c20f73f9d5" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-788b-9994-3cd2667cd5d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019efbec-d984-7393-ad18-8baec9fe8b8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-78c3-a532-9daaf8f9eaf2" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019efbec-d984-7393-ad18-8baec9fe8b8e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019efbec-d984-7fe1-8600-9eb1c97fe337" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-78c3-a532-9daaf8f9eaf2" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019efbec-d984-7fe1-8600-9eb1c97fe337" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesScheduleofFairValuesofForeignCurrencyDerivativeInstrumentDesignatedandNonDesignatedasHedgingInstrumentsinBalanceSheetDetails_1" xlink:type="simple" xlink:href="snps-20260731.xsd#FinancialAssetsandLiabilitiesScheduleofFairValuesofForeignCurrencyDerivativeInstrumentDesignatedandNonDesignatedasHedgingInstrumentsinBalanceSheetDetails_1"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesScheduleofFairValuesofForeignCurrencyDerivativeInstrumentDesignatedandNonDesignatedasHedgingInstrumentsinBalanceSheetDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-78c3-a532-9daaf8f9eaf2" xlink:href="snps-20260731.xsd#snps_FinancialAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7228-a80f-611a0afa8621" xlink:href="snps-20260731.xsd#snps_FinancialAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-78c3-a532-9daaf8f9eaf2" xlink:to="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7228-a80f-611a0afa8621" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019efbec-d984-7e1d-9354-39e89310c70a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7228-a80f-611a0afa8621" xlink:to="loc_us-gaap_HedgingDesignationAxis_019efbec-d984-7e1d-9354-39e89310c70a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-7e1d-9354-39e89310c70a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019efbec-d984-7e1d-9354-39e89310c70a" xlink:to="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-7e1d-9354-39e89310c70a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-76e9-93da-b9049827ffd6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019efbec-d984-7e1d-9354-39e89310c70a" xlink:to="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-76e9-93da-b9049827ffd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019efbec-d984-7ba6-9356-6f992642a640" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-76e9-93da-b9049827ffd6" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019efbec-d984-7ba6-9356-6f992642a640" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019efbec-d984-7901-be5f-136998bd0b14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019efbec-d984-76e9-93da-b9049827ffd6" xlink:to="loc_us-gaap_NondesignatedMember_019efbec-d984-7901-be5f-136998bd0b14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-74a3-9074-11f9bfa665c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7228-a80f-611a0afa8621" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-74a3-9074-11f9bfa665c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-74a3-9074-11f9bfa665c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-74a3-9074-11f9bfa665c5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-74a3-9074-11f9bfa665c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7941-acce-20c20f73f9d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-74a3-9074-11f9bfa665c5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7941-acce-20c20f73f9d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-788b-9994-3cd2667cd5d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7941-acce-20c20f73f9d5" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-788b-9994-3cd2667cd5d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019efbec-d984-7393-ad18-8baec9fe8b8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-78c3-a532-9daaf8f9eaf2" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019efbec-d984-7393-ad18-8baec9fe8b8e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019efbec-d984-7fe1-8600-9eb1c97fe337" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-78c3-a532-9daaf8f9eaf2" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019efbec-d984-7fe1-8600-9eb1c97fe337" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesScheduleofLocationoftheAmountsofGainsandLossesonDerivativeInstrumentFairValuesforDesignatedHedgingInstrumentsNetofTaxDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#FinancialAssetsandLiabilitiesScheduleofLocationoftheAmountsofGainsandLossesonDerivativeInstrumentFairValuesforDesignatedHedgingInstrumentsNetofTaxDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesScheduleofLocationoftheAmountsofGainsandLossesonDerivativeInstrumentFairValuesforDesignatedHedgingInstrumentsNetofTaxDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-77ff-9d5f-f7943c580662" xlink:href="snps-20260731.xsd#snps_FinancialAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7785-9e4b-d9973e7df7aa" xlink:href="snps-20260731.xsd#snps_FinancialAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-77ff-9d5f-f7943c580662" xlink:to="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7785-9e4b-d9973e7df7aa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-734a-9b10-355eb0149854" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7785-9e4b-d9973e7df7aa" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-734a-9b10-355eb0149854" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-734a-9b10-355eb0149854_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-734a-9b10-355eb0149854" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-734a-9b10-355eb0149854_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-72c0-addc-c7557b5f509d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-734a-9b10-355eb0149854" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-72c0-addc-c7557b5f509d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-7e33-8374-1f027f990d24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-72c0-addc-c7557b5f509d" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-7e33-8374-1f027f990d24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019efbec-d984-77be-bd6a-6f5ec10523b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-72c0-addc-c7557b5f509d" xlink:to="loc_us-gaap_InterestRateContractMember_019efbec-d984-77be-bd6a-6f5ec10523b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019efbec-d984-751e-b680-ca988c4bf26e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7785-9e4b-d9973e7df7aa" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019efbec-d984-751e-b680-ca988c4bf26e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_019efbec-d984-75ae-8751-260950bd13eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-77ff-9d5f-f7943c580662" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_019efbec-d984-75ae-8751-260950bd13eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_019efbec-d984-742e-851c-6d190844afa7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-77ff-9d5f-f7943c580662" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_019efbec-d984-742e-851c-6d190844afa7" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesScheduleofLocationoftheAmountsofGainsandLossesonDerivativeInstrumentFairValuesforDesignatedHedgingInstrumentsNetofTaxDetails_1" xlink:type="simple" xlink:href="snps-20260731.xsd#FinancialAssetsandLiabilitiesScheduleofLocationoftheAmountsofGainsandLossesonDerivativeInstrumentFairValuesforDesignatedHedgingInstrumentsNetofTaxDetails_1"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/FinancialAssetsandLiabilitiesScheduleofLocationoftheAmountsofGainsandLossesonDerivativeInstrumentFairValuesforDesignatedHedgingInstrumentsNetofTaxDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-77ff-9d5f-f7943c580662" xlink:href="snps-20260731.xsd#snps_FinancialAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7785-9e4b-d9973e7df7aa" xlink:href="snps-20260731.xsd#snps_FinancialAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-77ff-9d5f-f7943c580662" xlink:to="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7785-9e4b-d9973e7df7aa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-734a-9b10-355eb0149854" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesTable_019efbec-d984-7785-9e4b-d9973e7df7aa" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-734a-9b10-355eb0149854" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-734a-9b10-355eb0149854_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-734a-9b10-355eb0149854" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-734a-9b10-355eb0149854_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-72c0-addc-c7557b5f509d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-734a-9b10-355eb0149854" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-72c0-addc-c7557b5f509d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-7e33-8374-1f027f990d24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-72c0-addc-c7557b5f509d" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-7e33-8374-1f027f990d24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019efbec-d984-77be-bd6a-6f5ec10523b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-72c0-addc-c7557b5f509d" xlink:to="loc_us-gaap_InterestRateContractMember_019efbec-d984-77be-bd6a-6f5ec10523b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_019efbec-d984-75ae-8751-260950bd13eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-77ff-9d5f-f7943c580662" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_019efbec-d984-75ae-8751-260950bd13eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_019efbec-d984-742e-851c-6d190844afa7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_FinancialAssetsAndLiabilitiesLineItems_019efbec-d984-77ff-9d5f-f7943c580662" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_019efbec-d984-742e-851c-6d190844afa7" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/FairValueMeasurementsDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#FairValueMeasurementsDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/FairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019efbec-d984-7ee6-b165-6f43be1abc64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019efbec-d984-761b-ae5c-546b569787aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019efbec-d984-7ee6-b165-6f43be1abc64" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019efbec-d984-761b-ae5c-546b569787aa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_019efbec-d984-75ed-bdb9-51a560d7b528" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019efbec-d984-761b-ae5c-546b569787aa" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_019efbec-d984-75ed-bdb9-51a560d7b528" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019efbec-d984-75ed-bdb9-51a560d7b528_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019efbec-d984-75ed-bdb9-51a560d7b528" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019efbec-d984-75ed-bdb9-51a560d7b528_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019efbec-d984-76e8-a90c-54dc7b3dd6d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019efbec-d984-75ed-bdb9-51a560d7b528" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019efbec-d984-76e8-a90c-54dc7b3dd6d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_019efbec-d984-7398-aca7-ad3fa368b842" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019efbec-d984-76e8-a90c-54dc7b3dd6d9" xlink:to="loc_us-gaap_MoneyMarketFundsMember_019efbec-d984-7398-aca7-ad3fa368b842" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019efbec-d984-7ba8-9a61-2d08cb4984e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019efbec-d984-76e8-a90c-54dc7b3dd6d9" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019efbec-d984-7ba8-9a61-2d08cb4984e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019efbec-d984-716e-b8e9-8f30ead8bdd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019efbec-d984-761b-ae5c-546b569787aa" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019efbec-d984-716e-b8e9-8f30ead8bdd8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-716e-b8e9-8f30ead8bdd8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019efbec-d984-716e-b8e9-8f30ead8bdd8" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-716e-b8e9-8f30ead8bdd8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-7f09-ada9-a82095447a1e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019efbec-d984-716e-b8e9-8f30ead8bdd8" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-7f09-ada9-a82095447a1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019efbec-d984-74b1-9981-e7f9f8e12689" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-7f09-ada9-a82095447a1e" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019efbec-d984-74b1-9981-e7f9f8e12689" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_019efbec-d984-7c1f-9b71-2108609ecc24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-7f09-ada9-a82095447a1e" xlink:to="loc_us-gaap_MunicipalBondsMember_019efbec-d984-7c1f-9b71-2108609ecc24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019efbec-d984-7448-938c-32acc982b9b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-7f09-ada9-a82095447a1e" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019efbec-d984-7448-938c-32acc982b9b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_019efbf2-d84c-77c0-88c9-b6c71968dfcf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019efbec-d984-7f09-ada9-a82095447a1e" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_019efbf2-d84c-77c0-88c9-b6c71968dfcf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019efbec-d984-7db8-a042-a6e5db96a672" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019efbec-d984-761b-ae5c-546b569787aa" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019efbec-d984-7db8-a042-a6e5db96a672" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019efbec-d984-7db8-a042-a6e5db96a672_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019efbec-d984-7db8-a042-a6e5db96a672" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019efbec-d984-7db8-a042-a6e5db96a672_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019efbec-d984-7cff-b047-06fe5a48ee03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019efbec-d984-7db8-a042-a6e5db96a672" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019efbec-d984-7cff-b047-06fe5a48ee03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019efbec-d984-7283-9f4d-80f726c56b8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019efbec-d984-7cff-b047-06fe5a48ee03" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019efbec-d984-7283-9f4d-80f726c56b8a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019efbec-d984-7f3c-ae4a-f29234d0e7fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019efbec-d984-7cff-b047-06fe5a48ee03" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019efbec-d984-7f3c-ae4a-f29234d0e7fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019efbec-d984-780f-bcb2-b8e7b9041200" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019efbec-d984-7cff-b047-06fe5a48ee03" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019efbec-d984-780f-bcb2-b8e7b9041200" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-7cb2-a88e-f0a75e6cf2c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019efbec-d984-761b-ae5c-546b569787aa" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-7cb2-a88e-f0a75e6cf2c6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7cb2-a88e-f0a75e6cf2c6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-7cb2-a88e-f0a75e6cf2c6" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-7cb2-a88e-f0a75e6cf2c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-72ab-b031-c8e80adfdcf7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-d984-7cb2-a88e-f0a75e6cf2c6" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-72ab-b031-c8e80adfdcf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-7022-ab3d-6ddddd630add" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-d984-72ab-b031-c8e80adfdcf7" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019efbec-d984-7022-ab3d-6ddddd630add" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019efbec-d984-78bb-b254-46d2472ce6b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019efbec-d984-761b-ae5c-546b569787aa" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019efbec-d984-78bb-b254-46d2472ce6b7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019efbec-d984-78bb-b254-46d2472ce6b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019efbec-d984-78bb-b254-46d2472ce6b7" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019efbec-d984-78bb-b254-46d2472ce6b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019efbec-d984-76ac-abb6-42a903b3381f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019efbec-d984-78bb-b254-46d2472ce6b7" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019efbec-d984-76ac-abb6-42a903b3381f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019efbec-d984-7793-9aa6-f89ac0f66026" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019efbec-d984-76ac-abb6-42a903b3381f" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019efbec-d984-7793-9aa6-f89ac0f66026" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_019efbec-d984-7ea3-b5be-0dfa8b3cbe4c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019efbec-d984-7ee6-b165-6f43be1abc64" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_019efbec-d984-7ea3-b5be-0dfa8b3cbe4c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019efbec-d984-737a-81ea-410d9fe333dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019efbec-d984-7ea3-b5be-0dfa8b3cbe4c" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019efbec-d984-737a-81ea-410d9fe333dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019efbec-d984-7c11-bd4a-c451e6bbcd96" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019efbec-d984-7ea3-b5be-0dfa8b3cbe4c" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019efbec-d984-7c11-bd4a-c451e6bbcd96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_019efbec-d984-7a90-b091-ed4316b9827b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019efbec-d984-7ea3-b5be-0dfa8b3cbe4c" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_019efbec-d984-7a90-b091-ed4316b9827b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019efbec-d984-77cb-8158-c3cc8a66232c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_019efbec-d984-7a90-b091-ed4316b9827b" xlink:to="loc_us-gaap_DerivativeAssets_019efbec-d984-77cb-8158-c3cc8a66232c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DisposalGroupIncludingDiscontinuedOperationContingentConsideration_019efbec-d984-710b-9fd4-dc57409e26d4" xlink:href="snps-20260731.xsd#snps_DisposalGroupIncludingDiscontinuedOperationContingentConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_019efbec-d984-7a90-b091-ed4316b9827b" xlink:to="loc_snps_DisposalGroupIncludingDiscontinuedOperationContingentConsideration_019efbec-d984-710b-9fd4-dc57409e26d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrentAbstract_019efbec-d984-7f77-9ddf-9db68835cdc7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019efbec-d984-7ea3-b5be-0dfa8b3cbe4c" xlink:to="loc_us-gaap_OtherAssetsNoncurrentAbstract_019efbec-d984-7f77-9ddf-9db68835cdc7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationPlanAssets_019efbec-d984-7f86-a9ab-458630716fde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredCompensationPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_019efbec-d984-7f77-9ddf-9db68835cdc7" xlink:to="loc_us-gaap_DeferredCompensationPlanAssets_019efbec-d984-7f86-a9ab-458630716fde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFVNINoncurrent_019efbec-d984-73c2-9f70-1be23c6ceb70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFVNINoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_019efbec-d984-7f77-9ddf-9db68835cdc7" xlink:to="loc_us-gaap_EquitySecuritiesFVNINoncurrent_019efbec-d984-73c2-9f70-1be23c6ceb70" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019efbec-da2e-702f-8099-905a647976cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019efbec-d984-7ea3-b5be-0dfa8b3cbe4c" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019efbec-da2e-702f-8099-905a647976cb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019efbec-da2e-79b9-ac09-92423cad2315" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019efbec-d984-7ee6-b165-6f43be1abc64" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019efbec-da2e-79b9-ac09-92423cad2315" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019efbec-da2e-7356-9de0-3dca913a648a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019efbec-da2e-79b9-ac09-92423cad2315" xlink:to="loc_us-gaap_DerivativeLiabilities_019efbec-da2e-7356-9de0-3dca913a648a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_019efbec-da2e-7ef8-94dd-5c111663f6d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019efbec-da2e-79b9-ac09-92423cad2315" xlink:to="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_019efbec-da2e-7ef8-94dd-5c111663f6d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019efbec-da2e-7fcf-bc28-085d6d6b4184" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019efbec-da2e-79b9-ac09-92423cad2315" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019efbec-da2e-7fcf-bc28-085d6d6b4184" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/RestructuringChargesDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#RestructuringChargesDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/RestructuringChargesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019efbec-da2e-78de-be50-40bb3bab1afd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019efbec-da2e-7bf7-aafe-7adabd6ab4c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019efbec-da2e-78de-be50-40bb3bab1afd" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019efbec-da2e-7bf7-aafe-7adabd6ab4c2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019efbec-da2e-769b-a982-0b1f98b5b093" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019efbec-da2e-7bf7-aafe-7adabd6ab4c2" xlink:to="loc_srt_RangeAxis_019efbec-da2e-769b-a982-0b1f98b5b093" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019efbec-da2e-769b-a982-0b1f98b5b093_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019efbec-da2e-769b-a982-0b1f98b5b093" xlink:to="loc_srt_RangeMember_019efbec-da2e-769b-a982-0b1f98b5b093_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019efbec-da2e-73ac-81b3-108d9e0a8d91" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019efbec-da2e-769b-a982-0b1f98b5b093" xlink:to="loc_srt_RangeMember_019efbec-da2e-73ac-81b3-108d9e0a8d91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019efbec-da2e-7d1c-984a-0dcc1635f285" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019efbec-da2e-73ac-81b3-108d9e0a8d91" xlink:to="loc_srt_MinimumMember_019efbec-da2e-7d1c-984a-0dcc1635f285" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019efbec-da2e-7285-901b-4e700d3916c3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019efbec-da2e-73ac-81b3-108d9e0a8d91" xlink:to="loc_srt_MaximumMember_019efbec-da2e-7285-901b-4e700d3916c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_01a023e4-8cb4-7ca3-85cc-d2d0d8449c0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019efbec-da2e-7bf7-aafe-7adabd6ab4c2" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_01a023e4-8cb4-7ca3-85cc-d2d0d8449c0d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_01a023e4-8cb4-7ca3-85cc-d2d0d8449c0d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_01a023e4-8cb4-7ca3-85cc-d2d0d8449c0d" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_01a023e4-8cb4-7ca3-85cc-d2d0d8449c0d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_01a023e4-8cb4-7828-954c-d303106b0de8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_01a023e4-8cb4-7ca3-85cc-d2d0d8449c0d" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_01a023e4-8cb4-7828-954c-d303106b0de8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_01a023e4-b36b-787e-a649-990293161e15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_01a023e4-8cb4-7828-954c-d303106b0de8" xlink:to="loc_us-gaap_SubsequentEventMember_01a023e4-b36b-787e-a649-990293161e15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_019efbec-da2e-7c97-bd4e-3e60e786dd02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019efbec-da2e-78de-be50-40bb3bab1afd" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_019efbec-da2e-7c97-bd4e-3e60e786dd02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019efbec-da2e-7d23-b57f-42b7fa5b5460" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019efbec-da2e-78de-be50-40bb3bab1afd" xlink:to="loc_us-gaap_RestructuringCharges_019efbec-da2e-7d23-b57f-42b7fa5b5460" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_019efbec-da2e-75a6-a9fd-a077a4474d82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019efbec-da2e-78de-be50-40bb3bab1afd" xlink:to="loc_us-gaap_PaymentsForRestructuring_019efbec-da2e-75a6-a9fd-a077a4474d82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_019efbec-da2e-7dab-8616-deaf9f32685e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019efbec-da2e-78de-be50-40bb3bab1afd" xlink:to="loc_us-gaap_RestructuringReserve_019efbec-da2e-7dab-8616-deaf9f32685e" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/SeniorNotesBridgeCommitmentLetterTermLoanandRevolvingCreditFacilitiesScheduleofBorrowingsDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#SeniorNotesBridgeCommitmentLetterTermLoanandRevolvingCreditFacilitiesScheduleofBorrowingsDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/SeniorNotesBridgeCommitmentLetterTermLoanandRevolvingCreditFacilitiesScheduleofBorrowingsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-7431-8fea-8303e3ea76f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-7d8e-8eba-5b81d2fdae19" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-7431-8fea-8303e3ea76f2" xlink:to="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-7d8e-8eba-5b81d2fdae19" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019efbec-da2e-7031-bf54-3010b9932ffd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-7d8e-8eba-5b81d2fdae19" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019efbec-da2e-7031-bf54-3010b9932ffd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019efbec-da2e-7031-bf54-3010b9932ffd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019efbec-da2e-7031-bf54-3010b9932ffd" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019efbec-da2e-7031-bf54-3010b9932ffd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019efbec-da2e-793f-91fb-a9fbfce53694" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019efbec-da2e-7031-bf54-3010b9932ffd" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019efbec-da2e-793f-91fb-a9fbfce53694" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019efbec-da2e-7974-8ca3-4a9a6163b949" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019efbec-da2e-793f-91fb-a9fbfce53694" xlink:to="loc_us-gaap_SeniorNotesMember_019efbec-da2e-7974-8ca3-4a9a6163b949" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019efbec-da2e-7281-a4df-0380b5e9920a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-7d8e-8eba-5b81d2fdae19" xlink:to="loc_us-gaap_DebtInstrumentAxis_019efbec-da2e-7281-a4df-0380b5e9920a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-7281-a4df-0380b5e9920a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019efbec-da2e-7281-a4df-0380b5e9920a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-7281-a4df-0380b5e9920a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-7b53-9af8-cd79643f48a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019efbec-da2e-7281-a4df-0380b5e9920a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-7b53-9af8-cd79643f48a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_SeniorNotesDue2027Member_019efbec-da2e-760c-8142-f31603f82f08" xlink:href="snps-20260731.xsd#snps_SeniorNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-7b53-9af8-cd79643f48a9" xlink:to="loc_snps_SeniorNotesDue2027Member_019efbec-da2e-760c-8142-f31603f82f08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_SeniorNotesDue2028Member_019efbec-da2e-726d-9aad-f3ac76f4a9f9" xlink:href="snps-20260731.xsd#snps_SeniorNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-7b53-9af8-cd79643f48a9" xlink:to="loc_snps_SeniorNotesDue2028Member_019efbec-da2e-726d-9aad-f3ac76f4a9f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_SeniorNotesDue2030Member_019efbec-da2e-7290-89ba-28cbefcf10b0" xlink:href="snps-20260731.xsd#snps_SeniorNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-7b53-9af8-cd79643f48a9" xlink:to="loc_snps_SeniorNotesDue2030Member_019efbec-da2e-7290-89ba-28cbefcf10b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_SeniorNotesDue2032Member_019efbec-da2e-7b70-b861-b8d6a79d18c0" xlink:href="snps-20260731.xsd#snps_SeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-7b53-9af8-cd79643f48a9" xlink:to="loc_snps_SeniorNotesDue2032Member_019efbec-da2e-7b70-b861-b8d6a79d18c0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_SeniorNotesDue2035Member_019efbec-da2e-7c25-970b-83521d95c960" xlink:href="snps-20260731.xsd#snps_SeniorNotesDue2035Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-7b53-9af8-cd79643f48a9" xlink:to="loc_snps_SeniorNotesDue2035Member_019efbec-da2e-7c25-970b-83521d95c960" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_SeniorNotesDue2055Member_019efbec-da2e-7871-b82a-1c7ae83d909b" xlink:href="snps-20260731.xsd#snps_SeniorNotesDue2055Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-7b53-9af8-cd79643f48a9" xlink:to="loc_snps_SeniorNotesDue2055Member_019efbec-da2e-7871-b82a-1c7ae83d909b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019efbec-da2e-77ba-af3f-e8419f4e1776" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-7431-8fea-8303e3ea76f2" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019efbec-da2e-77ba-af3f-e8419f4e1776" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019efbec-da2e-7f25-a4f0-d4805daa5521" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-7431-8fea-8303e3ea76f2" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019efbec-da2e-7f25-a4f0-d4805daa5521" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019efbec-da2e-7db6-99e0-1d70e26854f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-7431-8fea-8303e3ea76f2" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019efbec-da2e-7db6-99e0-1d70e26854f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019efbec-da2e-7db3-aa54-76c594f5338d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-7431-8fea-8303e3ea76f2" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019efbec-da2e-7db3-aa54-76c594f5338d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DeferredPaymentLiabilityOnSettlementOfDerivative_019efbec-da2e-75f1-873d-4bdc43db85a2" xlink:href="snps-20260731.xsd#snps_DeferredPaymentLiabilityOnSettlementOfDerivative"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-7431-8fea-8303e3ea76f2" xlink:to="loc_snps_DeferredPaymentLiabilityOnSettlementOfDerivative_019efbec-da2e-75f1-873d-4bdc43db85a2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebt_019efbec-da2e-7114-8bdc-e871be1da9d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-7431-8fea-8303e3ea76f2" xlink:to="loc_us-gaap_OtherLongTermDebt_019efbec-da2e-7114-8bdc-e871be1da9d0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019efbec-da2e-7d6d-86b7-436d7ada8fc7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-7431-8fea-8303e3ea76f2" xlink:to="loc_us-gaap_LongTermDebt_019efbec-da2e-7d6d-86b7-436d7ada8fc7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019efbec-da2e-7bd9-953d-3665902975c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-7431-8fea-8303e3ea76f2" xlink:to="loc_us-gaap_LongTermDebtCurrent_019efbec-da2e-7bd9-953d-3665902975c7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019efbec-da2e-7717-a09d-92ed04fec5b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-7431-8fea-8303e3ea76f2" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019efbec-da2e-7717-a09d-92ed04fec5b2" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/SeniorNotesBridgeCommitmentLetterTermLoanandRevolvingCreditFacilitiesAdditionalInformationDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#SeniorNotesBridgeCommitmentLetterTermLoanandRevolvingCreditFacilitiesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/SeniorNotesBridgeCommitmentLetterTermLoanandRevolvingCreditFacilitiesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-78a4-90d6-c3132f3914af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-78a4-90d6-c3132f3914af" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019efbec-da2e-7599-8e13-e7acb5ec0ffb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-78a4-90d6-c3132f3914af" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019efbec-da2e-7599-8e13-e7acb5ec0ffb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019efbec-da2e-7599-8e13-e7acb5ec0ffb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019efbec-da2e-7599-8e13-e7acb5ec0ffb" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019efbec-da2e-7599-8e13-e7acb5ec0ffb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019efbec-da2e-7a61-9624-d516c76eee99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019efbec-da2e-7599-8e13-e7acb5ec0ffb" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019efbec-da2e-7a61-9624-d516c76eee99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019efbec-da2e-732d-b626-2ccd8d660d01" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019efbec-da2e-7a61-9624-d516c76eee99" xlink:to="loc_us-gaap_SeniorNotesMember_019efbec-da2e-732d-b626-2ccd8d660d01" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019efbec-da2e-7a72-90a0-7080ef555969" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019efbec-da2e-7a61-9624-d516c76eee99" xlink:to="loc_us-gaap_LineOfCreditMember_019efbec-da2e-7a72-90a0-7080ef555969" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignLineOfCreditMember_019efbec-da2e-772e-84f0-801491dd3a24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignLineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019efbec-da2e-7a61-9624-d516c76eee99" xlink:to="loc_us-gaap_ForeignLineOfCreditMember_019efbec-da2e-772e-84f0-801491dd3a24" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019efbec-da2e-735b-963d-dc008d2871f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-78a4-90d6-c3132f3914af" xlink:to="loc_us-gaap_DebtInstrumentAxis_019efbec-da2e-735b-963d-dc008d2871f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-735b-963d-dc008d2871f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019efbec-da2e-735b-963d-dc008d2871f2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-735b-963d-dc008d2871f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-71e7-804a-5daae8fc5843" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019efbec-da2e-735b-963d-dc008d2871f2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-71e7-804a-5daae8fc5843" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_BridgeCommitmentMember_019efbec-da2e-74e6-8003-e7b51fbd3aa0" xlink:href="snps-20260731.xsd#snps_BridgeCommitmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-71e7-804a-5daae8fc5843" xlink:to="loc_snps_BridgeCommitmentMember_019efbec-da2e-74e6-8003-e7b51fbd3aa0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_TermLoanAgreementMember_019efbec-da2e-737c-9356-fe4c1020f823" xlink:href="snps-20260731.xsd#snps_TermLoanAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-71e7-804a-5daae8fc5843" xlink:to="loc_snps_TermLoanAgreementMember_019efbec-da2e-737c-9356-fe4c1020f823" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_TermLoanDue2027Member_019efbec-da2e-7026-b6a3-58f15a817257" xlink:href="snps-20260731.xsd#snps_TermLoanDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_TermLoanAgreementMember_019efbec-da2e-737c-9356-fe4c1020f823" xlink:to="loc_snps_TermLoanDue2027Member_019efbec-da2e-7026-b6a3-58f15a817257" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_TermLoanDue2028Member_019efbec-da2e-7b01-80dc-bb0aac5222a6" xlink:href="snps-20260731.xsd#snps_TermLoanDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_TermLoanAgreementMember_019efbec-da2e-737c-9356-fe4c1020f823" xlink:to="loc_snps_TermLoanDue2028Member_019efbec-da2e-7b01-80dc-bb0aac5222a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_SeniorUnsecuredCommittedMulticurrencyRevolvingCreditFacilityMember_019efbec-da2e-7654-994b-ceb8ae13f766" xlink:href="snps-20260731.xsd#snps_SeniorUnsecuredCommittedMulticurrencyRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-71e7-804a-5daae8fc5843" xlink:to="loc_snps_SeniorUnsecuredCommittedMulticurrencyRevolvingCreditFacilityMember_019efbec-da2e-7654-994b-ceb8ae13f766" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_UnsecuredUncommittedIncrementalRevolvingLoanFacilityMember_019efbec-da2e-7a77-a5d9-ddbf35bb4a7b" xlink:href="snps-20260731.xsd#snps_UnsecuredUncommittedIncrementalRevolvingLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-71e7-804a-5daae8fc5843" xlink:to="loc_snps_UnsecuredUncommittedIncrementalRevolvingLoanFacilityMember_019efbec-da2e-7a77-a5d9-ddbf35bb4a7b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_RevolvingCreditAgreementMember_019efbec-da2e-7374-904d-b3087d29c5a0" xlink:href="snps-20260731.xsd#snps_RevolvingCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efbec-da2e-71e7-804a-5daae8fc5843" xlink:to="loc_snps_RevolvingCreditAgreementMember_019efbec-da2e-7374-904d-b3087d29c5a0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-da2e-7a0e-9b22-65e275f674eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-78a4-90d6-c3132f3914af" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-da2e-7a0e-9b22-65e275f674eb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-da2e-7a0e-9b22-65e275f674eb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-da2e-7a0e-9b22-65e275f674eb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-da2e-7a0e-9b22-65e275f674eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019efbec-da2e-74d7-b055-93802dd8df8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019efbec-da2e-7a0e-9b22-65e275f674eb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019efbec-da2e-74d7-b055-93802dd8df8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019efbec-da2e-786c-bd90-f4baf008e1fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019efbec-da2e-74d7-b055-93802dd8df8c" xlink:to="loc_us-gaap_InterestRateSwapMember_019efbec-da2e-786c-bd90-f4baf008e1fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019efbec-da2e-7b83-9482-30b23fcf20f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-78a4-90d6-c3132f3914af" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019efbec-da2e-7b83-9482-30b23fcf20f9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019efbec-da2e-7b83-9482-30b23fcf20f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019efbec-da2e-7b83-9482-30b23fcf20f9" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019efbec-da2e-7b83-9482-30b23fcf20f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019efbec-da2e-7af6-a689-ef77662f0143" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019efbec-da2e-7b83-9482-30b23fcf20f9" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019efbec-da2e-7af6-a689-ef77662f0143" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019efbec-da2e-7ec9-858d-c3b93bb827bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019efbec-da2e-7af6-a689-ef77662f0143" xlink:to="loc_us-gaap_CashFlowHedgingMember_019efbec-da2e-7ec9-858d-c3b93bb827bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019efbec-da2e-706d-b2af-fd7d0b46b39a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-78a4-90d6-c3132f3914af" xlink:to="loc_us-gaap_CreditFacilityAxis_019efbec-da2e-706d-b2af-fd7d0b46b39a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019efbec-da2e-706d-b2af-fd7d0b46b39a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019efbec-da2e-706d-b2af-fd7d0b46b39a" xlink:to="loc_us-gaap_CreditFacilityDomain_019efbec-da2e-706d-b2af-fd7d0b46b39a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019efbec-da2e-77ee-8df8-fd42d2cd37f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019efbec-da2e-706d-b2af-fd7d0b46b39a" xlink:to="loc_us-gaap_CreditFacilityDomain_019efbec-da2e-77ee-8df8-fd42d2cd37f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BridgeLoanMember_019efbec-da2e-70da-8573-e43fac1038d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BridgeLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019efbec-da2e-77ee-8df8-fd42d2cd37f5" xlink:to="loc_us-gaap_BridgeLoanMember_019efbec-da2e-70da-8573-e43fac1038d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_019efbec-da2e-7325-9315-09a89364f2e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019efbec-da2e-77ee-8df8-fd42d2cd37f5" xlink:to="loc_us-gaap_UnsecuredDebtMember_019efbec-da2e-7325-9315-09a89364f2e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019efbec-da2e-7c02-97c8-e366278bfbc2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019efbec-da2e-77ee-8df8-fd42d2cd37f5" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019efbec-da2e-7c02-97c8-e366278bfbc2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019efbec-da2e-701d-903a-966a8b21815c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-78a4-90d6-c3132f3914af" xlink:to="loc_srt_RangeAxis_019efbec-da2e-701d-903a-966a8b21815c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019efbec-da2e-701d-903a-966a8b21815c_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019efbec-da2e-701d-903a-966a8b21815c" xlink:to="loc_srt_RangeMember_019efbec-da2e-701d-903a-966a8b21815c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019efbec-da2e-7db1-abd4-1b57823052f4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019efbec-da2e-701d-903a-966a8b21815c" xlink:to="loc_srt_RangeMember_019efbec-da2e-7db1-abd4-1b57823052f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019efbec-da2e-7469-9287-d01de8088768" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019efbec-da2e-7db1-abd4-1b57823052f4" xlink:to="loc_srt_MinimumMember_019efbec-da2e-7469-9287-d01de8088768" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019efbec-da2e-75dc-b65b-81f02eb7d2f6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019efbec-da2e-7db1-abd4-1b57823052f4" xlink:to="loc_srt_MaximumMember_019efbec-da2e-75dc-b65b-81f02eb7d2f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019efbec-da2e-7922-8638-82f30dbd9544" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019efbec-da2e-78a4-90d6-c3132f3914af" xlink:to="loc_us-gaap_VariableRateAxis_019efbec-da2e-7922-8638-82f30dbd9544" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019efbec-da2e-7922-8638-82f30dbd9544_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019efbec-da2e-7922-8638-82f30dbd9544" xlink:to="loc_us-gaap_VariableRateDomain_019efbec-da2e-7922-8638-82f30dbd9544_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019efbec-da2e-7033-82a6-48ef58684946" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019efbec-da2e-7922-8638-82f30dbd9544" xlink:to="loc_us-gaap_VariableRateDomain_019efbec-da2e-7033-82a6-48ef58684946" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019efbec-da2e-7973-9d6b-911b5bf722bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019efbec-da2e-7033-82a6-48ef58684946" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019efbec-da2e-7973-9d6b-911b5bf722bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_ABRMember_019efbec-da2e-7960-9e49-a068f5065ce5" xlink:href="snps-20260731.xsd#snps_ABRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019efbec-da2e-7033-82a6-48ef58684946" xlink:to="loc_snps_ABRMember_019efbec-da2e-7960-9e49-a068f5065ce5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019efbec-da2e-7a19-97de-ed19daed952f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019efbec-da2e-7a19-97de-ed19daed952f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_019efbec-da2e-7113-8581-7954c54f38fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_019efbec-da2e-7113-8581-7954c54f38fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_019efbec-da2e-7a7a-84a7-89a00d8a2a08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_019efbec-da2e-7a7a-84a7-89a00d8a2a08" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_019efbec-da2e-7221-930d-ab80233ea8d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_019efbec-da2e-7221-930d-ab80233ea8d1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019efbec-da2e-7ad1-8925-c950d4fc1989" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_LongTermDebtFairValue_019efbec-da2e-7ad1-8925-c950d4fc1989" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTermOfContract_019efbec-da2e-7fed-af4d-a6c3714a01a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_DerivativeTermOfContract_019efbec-da2e-7fed-af4d-a6c3714a01a5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019efbec-da2e-7f27-9ae4-f8edcce2ed1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019efbec-da2e-7f27-9ae4-f8edcce2ed1a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019efbec-da2e-76f6-9a55-d60b0cb353bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019efbec-da2e-76f6-9a55-d60b0cb353bc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_019efbec-da2e-7c97-a26c-e21cf82b69ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_019efbec-da2e-7c97-a26c-e21cf82b69ee" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_019efbec-da2e-74f4-9544-68905e3c6c39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_RepaymentsOfDebt_019efbec-da2e-74f4-9544-68905e3c6c39" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019efbec-da2e-706d-b489-90e3d97aa1bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019efbec-da2e-706d-b489-90e3d97aa1bc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019efbec-da2e-7ecb-9906-0450a418244f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019efbec-da2e-7ecb-9906-0450a418244f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019efbec-da2e-719a-b467-0d03dfcfd6cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_LineOfCredit_019efbec-da2e-719a-b467-0d03dfcfd6cd" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019efbec-da2e-7c88-a1de-156958033a37" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efbec-da2e-73ff-8526-16af0f59aa55" xlink:to="loc_us-gaap_DebtInstrumentTerm_019efbec-da2e-7c88-a1de-156958033a37" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#AccumulatedOtherComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_019efbec-da2e-7708-9f96-a2a080674705" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_019efbec-da2e-7458-b7bb-781881ed7feb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_019efbec-da2e-7708-9f96-a2a080674705" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_019efbec-da2e-7458-b7bb-781881ed7feb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019efbec-da2e-78db-ba92-c88baf87fb92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_019efbec-da2e-7458-b7bb-781881ed7feb" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019efbec-da2e-78db-ba92-c88baf87fb92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019efbec-da2e-78db-ba92-c88baf87fb92_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019efbec-da2e-78db-ba92-c88baf87fb92" xlink:to="loc_us-gaap_EquityComponentDomain_019efbec-da2e-78db-ba92-c88baf87fb92_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019efbec-da2e-7766-ac04-0396d60ac9a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019efbec-da2e-78db-ba92-c88baf87fb92" xlink:to="loc_us-gaap_EquityComponentDomain_019efbec-da2e-7766-ac04-0396d60ac9a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019efbec-da2e-77f7-b6b2-ab4b87ae71f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019efbec-da2e-7766-ac04-0396d60ac9a4" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019efbec-da2e-77f7-b6b2-ab4b87ae71f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019efbec-da2e-7d3a-8e89-526ca5ba1d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019efbec-da2e-77f7-b6b2-ab4b87ae71f9" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019efbec-da2e-7d3a-8e89-526ca5ba1d3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019efbec-da2e-74d7-892c-0670a0a26c78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019efbec-da2e-77f7-b6b2-ab4b87ae71f9" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019efbec-da2e-74d7-892c-0670a0a26c78" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019efbec-da2e-732f-a6df-7a4752c4e32d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019efbec-da2e-77f7-b6b2-ab4b87ae71f9" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019efbec-da2e-732f-a6df-7a4752c4e32d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019efbec-da2e-7811-a23c-705289311a6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_019efbec-da2e-7708-9f96-a2a080674705" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019efbec-da2e-7811-a23c-705289311a6d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofEffectofAmountsReclassifiedoutofEachComponentofAccumulatedOtherComprehensiveIncomeLossintoNetIncomeDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#AccumulatedOtherComprehensiveIncomeLossScheduleofEffectofAmountsReclassifiedoutofEachComponentofAccumulatedOtherComprehensiveIncomeLossintoNetIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofEffectofAmountsReclassifiedoutofEachComponentofAccumulatedOtherComprehensiveIncomeLossintoNetIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_019efbec-da2e-71bf-a71c-d7f05ca89e27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_019efbec-da2e-74f8-b702-1f82232dbf8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_019efbec-da2e-71bf-a71c-d7f05ca89e27" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_019efbec-da2e-74f8-b702-1f82232dbf8f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_019efbec-da2e-7cc0-acdf-50e99758cf21" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_019efbec-da2e-74f8-b702-1f82232dbf8f" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_019efbec-da2e-7cc0-acdf-50e99758cf21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019efbec-da2e-7cc0-acdf-50e99758cf21_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_019efbec-da2e-7cc0-acdf-50e99758cf21" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019efbec-da2e-7cc0-acdf-50e99758cf21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019efbec-da2e-7343-8cc1-1fd53d074d18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_019efbec-da2e-7cc0-acdf-50e99758cf21" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019efbec-da2e-7343-8cc1-1fd53d074d18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_019efbec-da2e-794d-b23f-d8a4b9e28eb2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019efbec-da2e-7343-8cc1-1fd53d074d18" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_019efbec-da2e-794d-b23f-d8a4b9e28eb2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019efbec-da2e-77c2-98f2-9a6bf3dfd8ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_019efbec-da2e-74f8-b702-1f82232dbf8f" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019efbec-da2e-77c2-98f2-9a6bf3dfd8ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019efbec-da2e-77c2-98f2-9a6bf3dfd8ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019efbec-da2e-77c2-98f2-9a6bf3dfd8ec" xlink:to="loc_us-gaap_EquityComponentDomain_019efbec-da2e-77c2-98f2-9a6bf3dfd8ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019efbec-da2e-72dd-807e-de499e795d6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019efbec-da2e-77c2-98f2-9a6bf3dfd8ec" xlink:to="loc_us-gaap_EquityComponentDomain_019efbec-da2e-72dd-807e-de499e795d6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019efbec-da2e-7625-86ec-e1184ccc207f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019efbec-da2e-72dd-807e-de499e795d6f" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019efbec-da2e-7625-86ec-e1184ccc207f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019efbec-da2e-7bbf-bf8e-9b8d66edf598" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_019efbec-da2e-71bf-a71c-d7f05ca89e27" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019efbec-da2e-7bbf-bf8e-9b8d66edf598" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019efbec-da2e-7022-808b-9a110c12c53d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_019efbec-da2e-71bf-a71c-d7f05ca89e27" xlink:to="loc_us-gaap_OperatingExpenses_019efbec-da2e-7022-808b-9a110c12c53d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019efbec-da2e-7b5a-9ae4-0cccdaae8e2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_019efbec-da2e-71bf-a71c-d7f05ca89e27" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019efbec-da2e-7b5a-9ae4-0cccdaae8e2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019efbec-da2e-7e57-8147-18d23adffcf5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_019efbec-da2e-71bf-a71c-d7f05ca89e27" xlink:to="loc_us-gaap_NetIncomeLoss_019efbec-da2e-7e57-8147-18d23adffcf5" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/StockRepurchaseProgramAdditionalInformationDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#StockRepurchaseProgramAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/StockRepurchaseProgramAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcceleratedShareRepurchasesLineItems_019efbec-da2e-736b-9342-8dc6ac1f2e66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcceleratedShareRepurchasesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcceleratedShareRepurchasesTable_019efbec-da2e-7787-8722-d8808ccee4b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcceleratedShareRepurchasesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesLineItems_019efbec-da2e-736b-9342-8dc6ac1f2e66" xlink:to="loc_us-gaap_AcceleratedShareRepurchasesTable_019efbec-da2e-7787-8722-d8808ccee4b5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcceleratedShareRepurchasesDateAxis_019efbec-da2e-78a4-bde9-0fb0a3f44956" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcceleratedShareRepurchasesDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesTable_019efbec-da2e-7787-8722-d8808ccee4b5" xlink:to="loc_us-gaap_AcceleratedShareRepurchasesDateAxis_019efbec-da2e-78a4-bde9-0fb0a3f44956" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcceleratedShareRepurchasesDateDomain_019efbec-da2e-78a4-bde9-0fb0a3f44956_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcceleratedShareRepurchasesDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesDateAxis_019efbec-da2e-78a4-bde9-0fb0a3f44956" xlink:to="loc_us-gaap_AcceleratedShareRepurchasesDateDomain_019efbec-da2e-78a4-bde9-0fb0a3f44956_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcceleratedShareRepurchasesDateDomain_019efbec-da2e-705a-b8bf-75e8bb3f2542" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcceleratedShareRepurchasesDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesDateAxis_019efbec-da2e-78a4-bde9-0fb0a3f44956" xlink:to="loc_us-gaap_AcceleratedShareRepurchasesDateDomain_019efbec-da2e-705a-b8bf-75e8bb3f2542" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_AcceleratedShareRepurchaseProgramMarch2026Member_019efbec-da2e-7e10-908d-849df2dab1df" xlink:href="snps-20260731.xsd#snps_AcceleratedShareRepurchaseProgramMarch2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesDateDomain_019efbec-da2e-705a-b8bf-75e8bb3f2542" xlink:to="loc_snps_AcceleratedShareRepurchaseProgramMarch2026Member_019efbec-da2e-7e10-908d-849df2dab1df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019efbec-da2e-7a31-bc25-b39d1fd9fe57" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesTable_019efbec-da2e-7787-8722-d8808ccee4b5" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019efbec-da2e-7a31-bc25-b39d1fd9fe57" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019efbec-da2e-7a31-bc25-b39d1fd9fe57_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019efbec-da2e-7a31-bc25-b39d1fd9fe57" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019efbec-da2e-7a31-bc25-b39d1fd9fe57_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019efbec-da2e-7110-89b8-3779dd3c0f0c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019efbec-da2e-7a31-bc25-b39d1fd9fe57" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019efbec-da2e-7110-89b8-3779dd3c0f0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_OpenMarketPurchasesMember_019efbec-da2e-704a-b533-64bc8ffb44bc" xlink:href="snps-20260731.xsd#snps_OpenMarketPurchasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019efbec-da2e-7110-89b8-3779dd3c0f0c" xlink:to="loc_snps_OpenMarketPurchasesMember_019efbec-da2e-704a-b533-64bc8ffb44bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019efbec-da2e-7366-91d1-d38dd9f02334" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesLineItems_019efbec-da2e-736b-9342-8dc6ac1f2e66" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019efbec-da2e-7366-91d1-d38dd9f02334" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019efbec-da2e-725e-a89e-d236ab3090c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesLineItems_019efbec-da2e-736b-9342-8dc6ac1f2e66" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019efbec-da2e-725e-a89e-d236ab3090c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_StockRepurchaseProgramPrepaymentDuringPeriod_019efbec-da2e-7c5d-971e-62c74710e370" xlink:href="snps-20260731.xsd#snps_StockRepurchaseProgramPrepaymentDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesLineItems_019efbec-da2e-736b-9342-8dc6ac1f2e66" xlink:to="loc_snps_StockRepurchaseProgramPrepaymentDuringPeriod_019efbec-da2e-7c5d-971e-62c74710e370" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt_019efbec-da2e-79ed-b485-b3994513cbac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesLineItems_019efbec-da2e-736b-9342-8dc6ac1f2e66" xlink:to="loc_us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt_019efbec-da2e-79ed-b485-b3994513cbac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019efbec-da2e-7232-9c35-d9044e940b71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesLineItems_019efbec-da2e-736b-9342-8dc6ac1f2e66" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019efbec-da2e-7232-9c35-d9044e940b71" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019efbec-da2e-7ef8-b5be-80901536ffc7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesLineItems_019efbec-da2e-736b-9342-8dc6ac1f2e66" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019efbec-da2e-7ef8-b5be-80901536ffc7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019efbec-da2e-78ac-9f69-e4829314b179" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcceleratedShareRepurchasesLineItems_019efbec-da2e-736b-9342-8dc6ac1f2e66" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019efbec-da2e-78ac-9f69-e4829314b179" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/StockBasedCompensationScheduleofStockCompensationExpenseDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#StockBasedCompensationScheduleofStockCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/StockBasedCompensationScheduleofStockCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-7e63-bfa3-97f127cb7ca0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019efbec-da2e-72c6-a12a-c63e276dd761" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-7e63-bfa3-97f127cb7ca0" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019efbec-da2e-72c6-a12a-c63e276dd761" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019efbec-da2e-781c-96ef-b3d64a0300fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019efbec-da2e-72c6-a12a-c63e276dd761" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019efbec-da2e-781c-96ef-b3d64a0300fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019f21c6-9d46-7ed2-ade1-7a9de0e10ec4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019efbec-da2e-72c6-a12a-c63e276dd761" xlink:to="loc_srt_ProductOrServiceAxis_019f21c6-9d46-7ed2-ade1-7a9de0e10ec4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019f21c6-9d46-7ed2-ade1-7a9de0e10ec4_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019f21c6-9d46-7ed2-ade1-7a9de0e10ec4" xlink:to="loc_srt_ProductsAndServicesDomain_019f21c6-9d46-7ed2-ade1-7a9de0e10ec4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019f21c6-9d46-7418-a321-961159b6cbb0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019f21c6-9d46-7ed2-ade1-7a9de0e10ec4" xlink:to="loc_srt_ProductsAndServicesDomain_019f21c6-9d46-7418-a321-961159b6cbb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_019f21c6-e130-72b7-af26-489b5d84d185" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019f21c6-9d46-7418-a321-961159b6cbb0" xlink:to="loc_us-gaap_ProductMember_019f21c6-e130-72b7-af26-489b5d84d185" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyServiceMember_019f21c7-6343-788a-b6e1-1d9b2c618f03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TechnologyServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019f21c6-9d46-7418-a321-961159b6cbb0" xlink:to="loc_us-gaap_TechnologyServiceMember_019f21c7-6343-788a-b6e1-1d9b2c618f03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019efbec-da2e-7bc3-afef-da7122b60eca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-7e63-bfa3-97f127cb7ca0" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019efbec-da2e-7bc3-afef-da7122b60eca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019efbec-da2e-7d2d-ab0a-8e0b0edf7e36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-7e63-bfa3-97f127cb7ca0" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019efbec-da2e-7d2d-ab0a-8e0b0edf7e36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_019efbec-da2e-7451-aa35-e8277bb41aa8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-7e63-bfa3-97f127cb7ca0" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_019efbec-da2e-7451-aa35-e8277bb41aa8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/StockBasedCompensationScheduleofStockCompensationExpenseDetails_1" xlink:type="simple" xlink:href="snps-20260731.xsd#StockBasedCompensationScheduleofStockCompensationExpenseDetails_1"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/StockBasedCompensationScheduleofStockCompensationExpenseDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-7e63-bfa3-97f127cb7ca0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019efbec-da2e-72c6-a12a-c63e276dd761" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-7e63-bfa3-97f127cb7ca0" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019efbec-da2e-72c6-a12a-c63e276dd761" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019f21c6-9d46-7ed2-ade1-7a9de0e10ec4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019efbec-da2e-72c6-a12a-c63e276dd761" xlink:to="loc_srt_ProductOrServiceAxis_019f21c6-9d46-7ed2-ade1-7a9de0e10ec4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019f21c6-9d46-7ed2-ade1-7a9de0e10ec4_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019f21c6-9d46-7ed2-ade1-7a9de0e10ec4" xlink:to="loc_srt_ProductsAndServicesDomain_019f21c6-9d46-7ed2-ade1-7a9de0e10ec4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019f21c6-9d46-7418-a321-961159b6cbb0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019f21c6-9d46-7ed2-ade1-7a9de0e10ec4" xlink:to="loc_srt_ProductsAndServicesDomain_019f21c6-9d46-7418-a321-961159b6cbb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_019f21c6-e130-72b7-af26-489b5d84d185" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019f21c6-9d46-7418-a321-961159b6cbb0" xlink:to="loc_us-gaap_ProductMember_019f21c6-e130-72b7-af26-489b5d84d185" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyServiceMember_019f21c7-6343-788a-b6e1-1d9b2c618f03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TechnologyServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019f21c6-9d46-7418-a321-961159b6cbb0" xlink:to="loc_us-gaap_TechnologyServiceMember_019f21c7-6343-788a-b6e1-1d9b2c618f03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019efbec-da2e-7bc3-afef-da7122b60eca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-7e63-bfa3-97f127cb7ca0" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019efbec-da2e-7bc3-afef-da7122b60eca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019efbec-da2e-7d2d-ab0a-8e0b0edf7e36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-7e63-bfa3-97f127cb7ca0" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019efbec-da2e-7d2d-ab0a-8e0b0edf7e36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_019efbec-da2e-7451-aa35-e8277bb41aa8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-7e63-bfa3-97f127cb7ca0" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_019efbec-da2e-7451-aa35-e8277bb41aa8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/StockBasedCompensationScheduleofShareBasedPaymentAwardRestrictedStockUnitsValuationAssumptionsDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#StockBasedCompensationScheduleofShareBasedPaymentAwardRestrictedStockUnitsValuationAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/StockBasedCompensationScheduleofShareBasedPaymentAwardRestrictedStockUnitsValuationAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-70be-a210-23cf714f4fce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019efbec-da2e-768d-af65-e924bb5c1612" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-70be-a210-23cf714f4fce" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019efbec-da2e-768d-af65-e924bb5c1612" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019efbec-da2e-7797-8533-85c77fdd7b6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019efbec-da2e-768d-af65-e924bb5c1612" xlink:to="loc_us-gaap_AwardTypeAxis_019efbec-da2e-7797-8533-85c77fdd7b6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019efbec-da2e-7797-8533-85c77fdd7b6c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019efbec-da2e-7797-8533-85c77fdd7b6c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019efbec-da2e-7797-8533-85c77fdd7b6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019efbec-da2e-77bb-ae0f-3acc07845b73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019efbec-da2e-7797-8533-85c77fdd7b6c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019efbec-da2e-77bb-ae0f-3acc07845b73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_RestrictedStockUnitsRSUsMarketBasedMember_019efbec-da2e-7477-9415-86b8012c6955" xlink:href="snps-20260731.xsd#snps_RestrictedStockUnitsRSUsMarketBasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019efbec-da2e-77bb-ae0f-3acc07845b73" xlink:to="loc_snps_RestrictedStockUnitsRSUsMarketBasedMember_019efbec-da2e-7477-9415-86b8012c6955" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019efbec-da2e-7a65-b233-7923083f7966" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019efbec-da2e-768d-af65-e924bb5c1612" xlink:to="loc_srt_RangeAxis_019efbec-da2e-7a65-b233-7923083f7966" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019efbec-da2e-7a65-b233-7923083f7966_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019efbec-da2e-7a65-b233-7923083f7966" xlink:to="loc_srt_RangeMember_019efbec-da2e-7a65-b233-7923083f7966_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019efbec-da2e-72dc-8758-dde233a96797" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019efbec-da2e-7a65-b233-7923083f7966" xlink:to="loc_srt_RangeMember_019efbec-da2e-72dc-8758-dde233a96797" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019efbec-da2e-71b3-8b04-52d34a397cbc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019efbec-da2e-72dc-8758-dde233a96797" xlink:to="loc_srt_MinimumMember_019efbec-da2e-71b3-8b04-52d34a397cbc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019efbec-da2e-78d6-a48a-48001c49cae1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019efbec-da2e-72dc-8758-dde233a96797" xlink:to="loc_srt_MaximumMember_019efbec-da2e-78d6-a48a-48001c49cae1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019efbec-da2e-72ca-81bc-e209173f6cf7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-70be-a210-23cf714f4fce" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019efbec-da2e-72ca-81bc-e209173f6cf7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_019efbec-da2e-7133-a6fb-75dd2a32f61c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-70be-a210-23cf714f4fce" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_019efbec-da2e-7133-a6fb-75dd2a32f61c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_019efbec-da2e-735a-8ddf-f79610bc5c88" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-70be-a210-23cf714f4fce" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_019efbec-da2e-735a-8ddf-f79610bc5c88" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_019efbec-da2e-7492-affb-77d42cd14d0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-70be-a210-23cf714f4fce" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_019efbec-da2e-7492-affb-77d42cd14d0b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_019efbec-da2e-74f1-86fa-726abc1e5bce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-70be-a210-23cf714f4fce" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_019efbec-da2e-74f1-86fa-726abc1e5bce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019efbec-da2e-7d2f-be6d-c945b2829f1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019efbec-da2e-70be-a210-23cf714f4fce" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019efbec-da2e-7d2f-be6d-c945b2829f1c" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#StockBasedCompensationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019efbec-da2e-791a-b717-9dba09c780af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019efbec-da2e-7151-9526-2ea1f6c5625d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019efbec-da2e-791a-b717-9dba09c780af" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019efbec-da2e-7151-9526-2ea1f6c5625d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019efbec-da2e-7c35-8539-1dca2ba95e7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019efbec-da2e-7151-9526-2ea1f6c5625d" xlink:to="loc_us-gaap_AwardTypeAxis_019efbec-da2e-7c35-8539-1dca2ba95e7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019efbec-da2e-7c35-8539-1dca2ba95e7a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019efbec-da2e-7c35-8539-1dca2ba95e7a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019efbec-da2e-7c35-8539-1dca2ba95e7a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019efbec-da2e-7d47-921e-067cccd05331" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019efbec-da2e-7c35-8539-1dca2ba95e7a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019efbec-da2e-7d47-921e-067cccd05331" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_OptionRestrictedStockAndRestrictedStockUnitsMember_019efbec-da2e-7d3e-a325-d74dee7693a5" xlink:href="snps-20260731.xsd#snps_OptionRestrictedStockAndRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019efbec-da2e-7d47-921e-067cccd05331" xlink:to="loc_snps_OptionRestrictedStockAndRestrictedStockUnitsMember_019efbec-da2e-7d3e-a325-d74dee7693a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_019efbec-da2e-7a30-a5c9-c15bff33600a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019efbec-da2e-7d47-921e-067cccd05331" xlink:to="loc_us-gaap_EmployeeStockMember_019efbec-da2e-7a30-a5c9-c15bff33600a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019efbec-da2e-7dec-85bb-99508054ada4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019efbec-da2e-791a-b717-9dba09c780af" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019efbec-da2e-7dec-85bb-99508054ada4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019efbec-da2e-72b9-b21c-b43440fcd290" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019efbec-da2e-791a-b717-9dba09c780af" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019efbec-da2e-72b9-b21c-b43440fcd290" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/NetIncomeLossPerShareNarrativeDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#NetIncomeLossPerShareNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/NetIncomeLossPerShareNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_019efbec-da2f-781e-be37-ae21ca080d26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_019efbec-da2f-7b55-9e03-a3af58bb1d06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_019efbec-da2f-781e-be37-ae21ca080d26" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_019efbec-da2f-7b55-9e03-a3af58bb1d06" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019efbec-da2f-7cab-97ab-7e64d7d45673" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019efbec-da2f-7b55-9e03-a3af58bb1d06" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019efbec-da2f-7cab-97ab-7e64d7d45673" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019efbec-da2f-7cab-97ab-7e64d7d45673_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019efbec-da2f-7cab-97ab-7e64d7d45673" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019efbec-da2f-7cab-97ab-7e64d7d45673_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019efbec-da2f-754c-8e6a-9568ea3e59ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019efbec-da2f-7cab-97ab-7e64d7d45673" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019efbec-da2f-754c-8e6a-9568ea3e59ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivatePlacementMember_019efbec-da2f-7ae9-a9dd-912f2e00ee77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrivatePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019efbec-da2f-754c-8e6a-9568ea3e59ca" xlink:to="loc_us-gaap_PrivatePlacementMember_019efbec-da2f-7ae9-a9dd-912f2e00ee77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019efbec-da2f-7b3e-a6a3-888b8b0afbfa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019efbec-da2f-781e-be37-ae21ca080d26" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019efbec-da2f-7b3e-a6a3-888b8b0afbfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssuedPricePerShare_019efbec-da2f-7a8e-975e-202af4ecb9df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharesIssuedPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019efbec-da2f-781e-be37-ae21ca080d26" xlink:to="loc_us-gaap_SharesIssuedPricePerShare_019efbec-da2f-7a8e-975e-202af4ecb9df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfPrivatePlacement_019efbec-da2f-7d85-aa9e-8e4885803c1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfPrivatePlacement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019efbec-da2f-781e-be37-ae21ca080d26" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfPrivatePlacement_019efbec-da2f-7d85-aa9e-8e4885803c1d" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/SegmentDisclosureScheduleofSegmentReportingInformationDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#SegmentDisclosureScheduleofSegmentReportingInformationDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/SegmentDisclosureScheduleofSegmentReportingInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-74d5-96d4-119c18cee998" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019efbec-da2f-775d-9096-9e704b90d3a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-74d5-96d4-119c18cee998" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019efbec-da2f-775d-9096-9e704b90d3a3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019efbec-da2f-7eed-b05f-97037a166863" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019efbec-da2f-775d-9096-9e704b90d3a3" xlink:to="loc_srt_ConsolidationItemsAxis_019efbec-da2f-7eed-b05f-97037a166863" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019efbec-da2f-7eed-b05f-97037a166863_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019efbec-da2f-7eed-b05f-97037a166863" xlink:to="loc_srt_ConsolidationItemsDomain_019efbec-da2f-7eed-b05f-97037a166863_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019efbec-da2f-7d59-a403-bb1c6b95de6b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019efbec-da2f-7eed-b05f-97037a166863" xlink:to="loc_srt_ConsolidationItemsDomain_019efbec-da2f-7d59-a403-bb1c6b95de6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019efbec-da2f-7787-ad26-07fb54bd283c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019efbec-da2f-7d59-a403-bb1c6b95de6b" xlink:to="loc_us-gaap_OperatingSegmentsMember_019efbec-da2f-7787-ad26-07fb54bd283c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019efbec-da2f-753b-a72b-db624ba6b508" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019efbec-da2f-775d-9096-9e704b90d3a3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019efbec-da2f-753b-a72b-db624ba6b508" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019efbec-da2f-753b-a72b-db624ba6b508_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019efbec-da2f-753b-a72b-db624ba6b508" xlink:to="loc_us-gaap_SegmentDomain_019efbec-da2f-753b-a72b-db624ba6b508_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019efbec-da2f-7570-9500-e53bd5d1aea4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019efbec-da2f-753b-a72b-db624ba6b508" xlink:to="loc_us-gaap_SegmentDomain_019efbec-da2f-7570-9500-e53bd5d1aea4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DesignAutomationSegmentMember_019efbec-da2f-7496-bdfc-1e55ab9bc6a8" xlink:href="snps-20260731.xsd#snps_DesignAutomationSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019efbec-da2f-7570-9500-e53bd5d1aea4" xlink:to="loc_snps_DesignAutomationSegmentMember_019efbec-da2f-7496-bdfc-1e55ab9bc6a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_DesignIPSegmentMember_019efbec-da2f-78f3-89ef-02599bbc38ce" xlink:href="snps-20260731.xsd#snps_DesignIPSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019efbec-da2f-7570-9500-e53bd5d1aea4" xlink:to="loc_snps_DesignIPSegmentMember_019efbec-da2f-78f3-89ef-02599bbc38ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019efbec-da2f-79fa-b44c-8ab1864de1d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-74d5-96d4-119c18cee998" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019efbec-da2f-79fa-b44c-8ab1864de1d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_019efbec-da2f-7225-9a60-e003716a56d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-74d5-96d4-119c18cee998" xlink:to="loc_us-gaap_CostsAndExpenses_019efbec-da2f-7225-9a60-e003716a56d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019efbec-da2f-7d85-9a9d-7a949a0a15bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-74d5-96d4-119c18cee998" xlink:to="loc_us-gaap_OperatingIncomeLoss_019efbec-da2f-7d85-9a9d-7a949a0a15bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_OperatingMarginPercentage_019efbec-da2f-73ea-afdf-bf18f98167ad" xlink:href="snps-20260731.xsd#snps_OperatingMarginPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-74d5-96d4-119c18cee998" xlink:to="loc_snps_OperatingMarginPercentage_019efbec-da2f-73ea-afdf-bf18f98167ad" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/SegmentDisclosureScheduleofReconciliationofOperatingIncomefromSegmentstoConsolidationDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#SegmentDisclosureScheduleofReconciliationofOperatingIncomefromSegmentstoConsolidationDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/SegmentDisclosureScheduleofReconciliationofOperatingIncomefromSegmentstoConsolidationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-76df-9118-fc23f60f2340" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019efbec-da2f-701e-8f84-e77f8d12217a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-76df-9118-fc23f60f2340" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019efbec-da2f-701e-8f84-e77f8d12217a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019efbec-da2f-7e3d-a34c-03ca57e01715" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019efbec-da2f-701e-8f84-e77f8d12217a" xlink:to="loc_srt_ConsolidationItemsAxis_019efbec-da2f-7e3d-a34c-03ca57e01715" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019efbec-da2f-7e3d-a34c-03ca57e01715_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019efbec-da2f-7e3d-a34c-03ca57e01715" xlink:to="loc_srt_ConsolidationItemsDomain_019efbec-da2f-7e3d-a34c-03ca57e01715_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019efbec-da2f-7855-9f64-ca087dad5283" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019efbec-da2f-7e3d-a34c-03ca57e01715" xlink:to="loc_srt_ConsolidationItemsDomain_019efbec-da2f-7855-9f64-ca087dad5283" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019efbec-da2f-7cba-9107-7c101aa788ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019efbec-da2f-7855-9f64-ca087dad5283" xlink:to="loc_us-gaap_OperatingSegmentsMember_019efbec-da2f-7cba-9107-7c101aa788ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_019efbec-da2f-72b3-942d-4db6500a05f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019efbec-da2f-7855-9f64-ca087dad5283" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_019efbec-da2f-72b3-942d-4db6500a05f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_019efbec-da2f-7ac7-b076-3f627910eba2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOperatingActivitiesSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019efbec-da2f-701e-8f84-e77f8d12217a" xlink:to="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_019efbec-da2f-7ac7-b076-3f627910eba2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_019efbec-da2f-7ac7-b076-3f627910eba2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentOperatingActivitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_019efbec-da2f-7ac7-b076-3f627910eba2" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_019efbec-da2f-7ac7-b076-3f627910eba2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_019efbec-da2f-7db4-bd97-dffc55e9ff28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentOperatingActivitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_019efbec-da2f-7ac7-b076-3f627910eba2" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_019efbec-da2f-7db4-bd97-dffc55e9ff28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentContinuingOperationsMember_019efbec-da2f-7c8c-b578-42c1ea1701a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentContinuingOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentOperatingActivitiesDomain_019efbec-da2f-7db4-bd97-dffc55e9ff28" xlink:to="loc_us-gaap_SegmentContinuingOperationsMember_019efbec-da2f-7c8c-b578-42c1ea1701a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019efbec-da2f-77dd-ae9e-7642dd09576c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-76df-9118-fc23f60f2340" xlink:to="loc_us-gaap_OperatingIncomeLoss_019efbec-da2f-77dd-ae9e-7642dd09576c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_AmortizationOfIntangibleAssetsAndCostAmortization_019efbec-da2f-7f39-b140-c89adb97f0d5" xlink:href="snps-20260731.xsd#snps_AmortizationOfIntangibleAssetsAndCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-76df-9118-fc23f60f2340" xlink:to="loc_snps_AmortizationOfIntangibleAssetsAndCostAmortization_019efbec-da2f-7f39-b140-c89adb97f0d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019efbec-da2f-7782-a369-4b2d593dfe2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-76df-9118-fc23f60f2340" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019efbec-da2f-7782-a369-4b2d593dfe2b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019efbec-da2f-7843-b581-c20bde9b8c1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-76df-9118-fc23f60f2340" xlink:to="loc_us-gaap_RestructuringCharges_019efbec-da2f-7843-b581-c20bde9b8c1c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_BusinessAcquisitionAndDivestitureRelatedExpenses_019efbec-da2f-7242-8e5b-c217926aaa05" xlink:href="snps-20260731.xsd#snps_BusinessAcquisitionAndDivestitureRelatedExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-76df-9118-fc23f60f2340" xlink:to="loc_snps_BusinessAcquisitionAndDivestitureRelatedExpenses_019efbec-da2f-7242-8e5b-c217926aaa05" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_GainLossOnAssetsRelatedToDeferredCompensationPlan_019efbec-da2f-7ee3-8cd1-027f724f14be" xlink:href="snps-20260731.xsd#snps_GainLossOnAssetsRelatedToDeferredCompensationPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019efbec-da2f-76df-9118-fc23f60f2340" xlink:to="loc_snps_GainLossOnAssetsRelatedToDeferredCompensationPlan_019efbec-da2f-7ee3-8cd1-027f724f14be" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/SegmentDisclosureScheduleofRevenuesRelatedtoOperationsbyGeographicAreasDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#SegmentDisclosureScheduleofRevenuesRelatedtoOperationsbyGeographicAreasDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/SegmentDisclosureScheduleofRevenuesRelatedtoOperationsbyGeographicAreasDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019efbec-da2f-7e4a-bdf5-08b11ec0127e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019efbec-da2f-7048-93b7-9553b41a308a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019efbec-da2f-7e4a-bdf5-08b11ec0127e" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019efbec-da2f-7048-93b7-9553b41a308a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019efbec-da2f-712f-ab30-26bda9dd7f32" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019efbec-da2f-7048-93b7-9553b41a308a" xlink:to="loc_srt_StatementGeographicalAxis_019efbec-da2f-712f-ab30-26bda9dd7f32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019efbec-da2f-712f-ab30-26bda9dd7f32_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019efbec-da2f-712f-ab30-26bda9dd7f32" xlink:to="loc_srt_SegmentGeographicalDomain_019efbec-da2f-712f-ab30-26bda9dd7f32_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019efbec-da2f-771e-bfe1-7ca42f697ddf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019efbec-da2f-712f-ab30-26bda9dd7f32" xlink:to="loc_srt_SegmentGeographicalDomain_019efbec-da2f-771e-bfe1-7ca42f697ddf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019efbec-da2f-791f-8be8-3ddb1b97eb48" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019efbec-da2f-771e-bfe1-7ca42f697ddf" xlink:to="loc_country_US_019efbec-da2f-791f-8be8-3ddb1b97eb48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EuropeMember_019efbec-da2f-79cc-8b13-5c3efd8c8178" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EuropeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019efbec-da2f-771e-bfe1-7ca42f697ddf" xlink:to="loc_srt_EuropeMember_019efbec-da2f-79cc-8b13-5c3efd8c8178" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_KR_019efbec-da2f-73f0-b4e2-5bc51e450e7a" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_KR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019efbec-da2f-771e-bfe1-7ca42f697ddf" xlink:to="loc_country_KR_019efbec-da2f-73f0-b4e2-5bc51e450e7a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_019efbec-da2f-72ea-8804-5d4982ee3e85" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019efbec-da2f-771e-bfe1-7ca42f697ddf" xlink:to="loc_country_CN_019efbec-da2f-72ea-8804-5d4982ee3e85" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_OtherCountriesMember_019efbec-da2f-7068-9bff-54a3b372247e" xlink:href="snps-20260731.xsd#snps_OtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019efbec-da2f-771e-bfe1-7ca42f697ddf" xlink:to="loc_snps_OtherCountriesMember_019efbec-da2f-7068-9bff-54a3b372247e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019efbec-da2f-77e0-999d-cb65c26b4677" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019efbec-da2f-7e4a-bdf5-08b11ec0127e" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019efbec-da2f-77e0-999d-cb65c26b4677" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.synopsys.com/role/IncomeTaxesAdditionalInformationDetails" xlink:type="simple" xlink:href="snps-20260731.xsd#IncomeTaxesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.synopsys.com/role/IncomeTaxesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_snps_TaxesLineItems_019efbec-da2f-73c7-a231-5960ff0a29eb" xlink:href="snps-20260731.xsd#snps_TaxesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_snps_TaxesTable_019efbec-da2f-7127-905a-5a31f1dedf27" xlink:href="snps-20260731.xsd#snps_TaxesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_snps_TaxesLineItems_019efbec-da2f-73c7-a231-5960ff0a29eb" xlink:to="loc_snps_TaxesTable_019efbec-da2f-7127-905a-5a31f1dedf27" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019efbec-da2f-7f2c-a1ce-709ef145b634" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_snps_TaxesTable_019efbec-da2f-7127-905a-5a31f1dedf27" xlink:to="loc_srt_RangeAxis_019efbec-da2f-7f2c-a1ce-709ef145b634" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019efbec-da2f-7f2c-a1ce-709ef145b634_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019efbec-da2f-7f2c-a1ce-709ef145b634" xlink:to="loc_srt_RangeMember_019efbec-da2f-7f2c-a1ce-709ef145b634_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019efbec-da2f-720e-9b65-83fd3c90f894" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019efbec-da2f-7f2c-a1ce-709ef145b634" xlink:to="loc_srt_RangeMember_019efbec-da2f-720e-9b65-83fd3c90f894" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019efbec-da2f-7a88-b331-3f055079ea9c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019efbec-da2f-720e-9b65-83fd3c90f894" xlink:to="loc_srt_MinimumMember_019efbec-da2f-7a88-b331-3f055079ea9c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019efbec-da2f-711a-8eaa-0831594ef98a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019efbec-da2f-720e-9b65-83fd3c90f894" xlink:to="loc_srt_MaximumMember_019efbec-da2f-711a-8eaa-0831594ef98a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019efbec-da2f-7264-be79-ecca71da85ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_TaxesLineItems_019efbec-da2f-73c7-a231-5960ff0a29eb" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019efbec-da2f-7264-be79-ecca71da85ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_019efbec-da2f-76e0-905d-2d2a1d1e4ad0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snps_TaxesLineItems_019efbec-da2f-73c7-a231-5960ff0a29eb" xlink:to="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_019efbec-da2f-76e0-905d-2d2a1d1e4ad0" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
