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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fd8eb-2713-702c-aa0d-dbb204be64b2,g:6ab95fb1-884d-4b75-928a-92a59de11b05-->
<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://silvaco.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="svco-20260930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7dcd-b310-309741d56d79" 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_019fd8eb-27d1-7840-9216-12876823d270" 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_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_StatementTable_019fd8eb-27d1-7840-9216-12876823d270" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019fd8eb-27d1-7719-8ea7-509629a63fbf" 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_019fd8eb-27d1-7840-9216-12876823d270" xlink:to="loc_srt_ProductOrServiceAxis_019fd8eb-27d1-7719-8ea7-509629a63fbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019fd8eb-27d1-7719-8ea7-509629a63fbf_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_019fd8eb-27d1-7719-8ea7-509629a63fbf" xlink:to="loc_srt_ProductsAndServicesDomain_019fd8eb-27d1-7719-8ea7-509629a63fbf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019fd8eb-27d1-72c0-a010-04d650914a3b" 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_019fd8eb-27d1-7719-8ea7-509629a63fbf" xlink:to="loc_srt_ProductsAndServicesDomain_019fd8eb-27d1-72c0-a010-04d650914a3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicenseMember_019fd8eb-27d1-70d4-b310-1c3df5b3d24c" 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_srt_ProductsAndServicesDomain_019fd8eb-27d1-72c0-a010-04d650914a3b" xlink:to="loc_us-gaap_LicenseMember_019fd8eb-27d1-70d4-b310-1c3df5b3d24c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_SoftwareMaintenanceAndServiceMember_019fd8eb-27d1-7f62-a584-4e47520cd115" xlink:href="svco-20260930.xsd#svco_SoftwareMaintenanceAndServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019fd8eb-27d1-72c0-a010-04d650914a3b" xlink:to="loc_svco_SoftwareMaintenanceAndServiceMember_019fd8eb-27d1-7f62-a584-4e47520cd115" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_019fd8eb-27d1-74b3-ba4a-cc1df89a77a7" 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_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_RevenuesAbstract_019fd8eb-27d1-74b3-ba4a-cc1df89a77a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019fd8eb-27d1-7252-865d-01af7a30c5c9" 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_019fd8eb-27d1-74b3-ba4a-cc1df89a77a7" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019fd8eb-27d1-7252-865d-01af7a30c5c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019fd8eb-27d1-7dbb-aa4b-7b881eee510d" 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_StatementLineItems_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019fd8eb-27d1-7dbb-aa4b-7b881eee510d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019fd8eb-27d1-7fa7-81fb-98856dccbe2d" 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_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_GrossProfit_019fd8eb-27d1-7fa7-81fb-98856dccbe2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_019fd8eb-27d1-75e9-92b5-1b615fd007e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_019fd8eb-27d1-75e9-92b5-1b615fd007e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_019fd8eb-27d1-794b-a3f9-c90e50067003" 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_CostsAndExpensesAbstract_019fd8eb-27d1-75e9-92b5-1b615fd007e2" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_019fd8eb-27d1-794b-a3f9-c90e50067003" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_019fd8eb-27d1-713b-b812-a65cf81e4864" 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_CostsAndExpensesAbstract_019fd8eb-27d1-75e9-92b5-1b615fd007e2" xlink:to="loc_us-gaap_SellingAndMarketingExpense_019fd8eb-27d1-713b-b812-a65cf81e4864" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019fd8eb-27d1-778d-b86e-43702ce1650c" 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_CostsAndExpensesAbstract_019fd8eb-27d1-75e9-92b5-1b615fd007e2" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019fd8eb-27d1-778d-b86e-43702ce1650c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyLossInPeriod_019fd8eb-27d1-7186-8c88-7006ac77a179" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyLossInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019fd8eb-27d1-75e9-92b5-1b615fd007e2" xlink:to="loc_us-gaap_LossContingencyLossInPeriod_019fd8eb-27d1-7186-8c88-7006ac77a179" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019fd8eb-27d1-71b3-9c83-c5084207478a" 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_CostsAndExpensesAbstract_019fd8eb-27d1-75e9-92b5-1b615fd007e2" xlink:to="loc_us-gaap_OperatingExpenses_019fd8eb-27d1-71b3-9c83-c5084207478a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019fd8eb-27d1-7865-b597-d99a15cf4873" 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_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_OperatingIncomeLoss_019fd8eb-27d1-7865-b597-d99a15cf4873" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_019fd8eb-27d1-716b-9a19-2bb33dde8081" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_InvestmentIncomeInterest_019fd8eb-27d1-716b-9a19-2bb33dde8081" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019fd8eb-27d1-744f-aa7d-474f43749bc9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019fd8eb-27d1-744f-aa7d-474f43749bc9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd8eb-27d1-7085-8d0a-a57d3bad06d9" 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_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd8eb-27d1-7085-8d0a-a57d3bad06d9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019fd8eb-27d1-779b-9b91-12286f0d8525" 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_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019fd8eb-27d1-779b-9b91-12286f0d8525" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fd8eb-27d1-7701-ac4d-0c3402f6d924" 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_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_NetIncomeLoss_019fd8eb-27d1-7701-ac4d-0c3402f6d924" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_019fd8eb-27d1-72e5-a879-ce9efbd5b3f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_EarningsPerShareAbstract_019fd8eb-27d1-72e5-a879-ce9efbd5b3f6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019fd8eb-27d1-77c4-8388-2945b36396dc" 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_EarningsPerShareAbstract_019fd8eb-27d1-72e5-a879-ce9efbd5b3f6" xlink:to="loc_us-gaap_EarningsPerShareBasic_019fd8eb-27d1-77c4-8388-2945b36396dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019fd8eb-27d1-7865-b6e9-7621b60b9703" 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_EarningsPerShareAbstract_019fd8eb-27d1-72e5-a879-ce9efbd5b3f6" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019fd8eb-27d1-7865-b6e9-7621b60b9703" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019fd8eb-27d1-7351-8bf0-22f9513aba6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7dcd-b310-309741d56d79" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019fd8eb-27d1-7351-8bf0-22f9513aba6c" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019fd8eb-27d1-7067-86c5-129f8a82310c" 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_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019fd8eb-27d1-7351-8bf0-22f9513aba6c" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019fd8eb-27d1-7067-86c5-129f8a82310c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fd8eb-27d1-7066-8b30-ffa107990b54" 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_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019fd8eb-27d1-7351-8bf0-22f9513aba6c" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fd8eb-27d1-7066-8b30-ffa107990b54" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="svco-20260930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7e3d-b876-9e8f4872b134" 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_019fd8eb-27d1-7e97-abb4-6c6b5303ce7f" 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_019fd8eb-27d1-7e3d-b876-9e8f4872b134" xlink:to="loc_us-gaap_StatementTable_019fd8eb-27d1-7e97-abb4-6c6b5303ce7f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019fd8eb-27d1-7dcb-bd39-1b405b4fbd2c" 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_019fd8eb-27d1-7e97-abb4-6c6b5303ce7f" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019fd8eb-27d1-7dcb-bd39-1b405b4fbd2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019fd8eb-27d1-7dcb-bd39-1b405b4fbd2c_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_019fd8eb-27d1-7dcb-bd39-1b405b4fbd2c" xlink:to="loc_us-gaap_EquityComponentDomain_019fd8eb-27d1-7dcb-bd39-1b405b4fbd2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019fd8eb-27d1-7a51-932c-9d663bf78ebc" 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_019fd8eb-27d1-7dcb-bd39-1b405b4fbd2c" xlink:to="loc_us-gaap_EquityComponentDomain_019fd8eb-27d1-7a51-932c-9d663bf78ebc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019fd8eb-27d1-7289-95b4-244a3a638153" 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_EquityComponentDomain_019fd8eb-27d1-7a51-932c-9d663bf78ebc" xlink:to="loc_us-gaap_CommonStockMember_019fd8eb-27d1-7289-95b4-244a3a638153" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019fd8eb-27d1-7b07-a877-109c132ddf7a" 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_EquityComponentDomain_019fd8eb-27d1-7a51-932c-9d663bf78ebc" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019fd8eb-27d1-7b07-a877-109c132ddf7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019fd8eb-27d1-7289-80f7-9424695e0f79" 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_EquityComponentDomain_019fd8eb-27d1-7a51-932c-9d663bf78ebc" xlink:to="loc_us-gaap_RetainedEarningsMember_019fd8eb-27d1-7289-80f7-9424695e0f79" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019fd8eb-27d1-7c38-b0c7-2eaa19920da6" 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_019fd8eb-27d1-7a51-932c-9d663bf78ebc" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019fd8eb-27d1-7c38-b0c7-2eaa19920da6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" 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_019fd8eb-27d1-7e3d-b876-9e8f4872b134" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019fd8eb-27d1-7073-98b2-8577d9dde8a3" 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_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019fd8eb-27d1-7073-98b2-8577d9dde8a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019fd8eb-27d1-7577-9521-6c3f1ce20089" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" xlink:to="loc_us-gaap_StockholdersEquity_019fd8eb-27d1-7577-9521-6c3f1ce20089" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019fd8eb-27d1-7fdf-a008-68feb28cff25" 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_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019fd8eb-27d1-7fdf-a008-68feb28cff25" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019fd8eb-27d1-7b43-945c-65a64e217c31" 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_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019fd8eb-27d1-7b43-945c-65a64e217c31" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_019fd8eb-27d1-75ff-9f1b-554740cec7ff" 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_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_019fd8eb-27d1-75ff-9f1b-554740cec7ff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_019fd8eb-27d1-7904-a55c-62f375dcd510" 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_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_019fd8eb-27d1-7904-a55c-62f375dcd510" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019fd8eb-27d1-745f-ab6d-01725887da5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019fd8eb-27d1-745f-ab6d-01725887da5c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019fd8eb-27d1-7a40-bf3b-6f08ef27e878" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019fd8eb-27d1-7a40-bf3b-6f08ef27e878" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019fd8eb-27d1-7122-bb7c-26a7beb5edc0" 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_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019fd8eb-27d1-7122-bb7c-26a7beb5edc0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd8eb-27d1-7117-95a6-f9e680019f22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd8eb-27d1-7117-95a6-f9e680019f22" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fd8eb-27d1-7c95-af80-0e71ec0b82d8" 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_IncreaseDecreaseInStockholdersEquityRollForward_019fd8eb-27d1-78bd-8a54-ef1f0c92809f" xlink:to="loc_us-gaap_NetIncomeLoss_019fd8eb-27d1-7c95-af80-0e71ec0b82d8" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019fd8eb-27d1-72c7-92bf-d480d2bfd6ff" 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_StockholdersEquity_019fd8eb-27d1-794b-a0d8-01405a88ffcf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="svco-20260930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7b69-94d9-ffd06e3e1496" 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_019fd8eb-27d1-7a24-8553-b9daf7e6fe19" 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_019fd8eb-27d1-7b69-94d9-ffd06e3e1496" xlink:to="loc_us-gaap_StatementTable_019fd8eb-27d1-7a24-8553-b9daf7e6fe19" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019fd8eb-27d1-7f99-81e0-7a323794dc6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019fd8eb-27d1-7a24-8553-b9daf7e6fe19" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019fd8eb-27d1-7f99-81e0-7a323794dc6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019fd8eb-27d1-7f99-81e0-7a323794dc6f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019fd8eb-27d1-7f99-81e0-7a323794dc6f" xlink:to="loc_us-gaap_RelatedPartyDomain_019fd8eb-27d1-7f99-81e0-7a323794dc6f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019fd8eb-27d1-73dd-8e90-dbdc6ad17de7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019fd8eb-27d1-7f99-81e0-7a323794dc6f" xlink:to="loc_us-gaap_RelatedPartyDomain_019fd8eb-27d1-73dd-8e90-dbdc6ad17de7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019fd8eb-27d1-7918-9ce1-c768e749e901" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019fd8eb-27d1-73dd-8e90-dbdc6ad17de7" xlink:to="loc_us-gaap_NonrelatedPartyMember_019fd8eb-27d1-7918-9ce1-c768e749e901" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019fd8eb-27d1-78ec-9e80-6708e106582d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019fd8eb-27d1-73dd-8e90-dbdc6ad17de7" xlink:to="loc_us-gaap_RelatedPartyMember_019fd8eb-27d1-78ec-9e80-6708e106582d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019fd8eb-27d1-77fa-9795-a7cf08beb72a" 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_019fd8eb-27d1-7b69-94d9-ffd06e3e1496" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019fd8eb-27d1-77fa-9795-a7cf08beb72a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fd8eb-27d1-7cb0-a7bf-41e32884efce" 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_NetCashProvidedByUsedInOperatingActivitiesAbstract_019fd8eb-27d1-77fa-9795-a7cf08beb72a" xlink:to="loc_us-gaap_NetIncomeLoss_019fd8eb-27d1-7cb0-a7bf-41e32884efce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019fd8eb-27d1-7ddc-9883-e9b0c6bd5a98" 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_019fd8eb-27d1-77fa-9795-a7cf08beb72a" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019fd8eb-27d1-7ddc-9883-e9b0c6bd5a98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019fd8eb-27d1-74d9-a1b7-a6371022a9c2" 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_019fd8eb-27d1-7ddc-9883-e9b0c6bd5a98" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019fd8eb-27d1-74d9-a1b7-a6371022a9c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019fd8eb-27d1-777d-90a0-7fa8fb65f6cd" 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_019fd8eb-27d1-7ddc-9883-e9b0c6bd5a98" xlink:to="loc_us-gaap_ShareBasedCompensation_019fd8eb-27d1-777d-90a0-7fa8fb65f6cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_01a13842-316e-711d-adc7-d941f4b07498" 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_019fd8eb-27d1-7ddc-9883-e9b0c6bd5a98" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_01a13842-316e-711d-adc7-d941f4b07498" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_AccountsReceivableCreditLossExpenseReversalIncludingRecovery_019fd8eb-27d1-7083-8ecd-6de641eb703a" xlink:href="svco-20260930.xsd#svco_AccountsReceivableCreditLossExpenseReversalIncludingRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019fd8eb-27d1-7ddc-9883-e9b0c6bd5a98" xlink:to="loc_svco_AccountsReceivableCreditLossExpenseReversalIncludingRecovery_019fd8eb-27d1-7083-8ecd-6de641eb703a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLegalSettlements_019fd8eb-27d1-7a74-9879-4f3aa0d641ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromLegalSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019fd8eb-27d1-7ddc-9883-e9b0c6bd5a98" xlink:to="loc_us-gaap_ProceedsFromLegalSettlements_019fd8eb-27d1-7a74-9879-4f3aa0d641ba" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_019fd8eb-27d1-7099-afe7-2aa7a324224c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019fd8eb-27d1-7ddc-9883-e9b0c6bd5a98" xlink:to="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_019fd8eb-27d1-7099-afe7-2aa7a324224c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_019fd8eb-27d1-74fa-bb58-e7bd4e7fceb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019fd8eb-27d1-7ddc-9883-e9b0c6bd5a98" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_019fd8eb-27d1-74fa-bb58-e7bd4e7fceb9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019fd8eb-27d1-7020-87c5-63e57cbaf0a7" 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_019fd8eb-27d1-7ddc-9883-e9b0c6bd5a98" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019fd8eb-27d1-7020-87c5-63e57cbaf0a7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019fd8eb-27d1-7114-acc6-36e57d7ae0e0" 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_019fd8eb-27d1-7020-87c5-63e57cbaf0a7" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019fd8eb-27d1-7114-acc6-36e57d7ae0e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerAsset_019fd8eb-27d1-709b-bc98-4326e9d6a875" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019fd8eb-27d1-7020-87c5-63e57cbaf0a7" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerAsset_019fd8eb-27d1-709b-bc98-4326e9d6a875" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_019fd8eb-27d1-7e84-b83a-ecd0be88c711" 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_019fd8eb-27d1-7020-87c5-63e57cbaf0a7" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_019fd8eb-27d1-7e84-b83a-ecd0be88c711" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_019fd8eb-27d1-780d-a495-d4195aa2c1b8" 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_019fd8eb-27d1-7020-87c5-63e57cbaf0a7" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_019fd8eb-27d1-780d-a495-d4195aa2c1b8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019fd8eb-27d1-7ced-8ca7-dea73dab5558" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019fd8eb-27d1-7020-87c5-63e57cbaf0a7" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019fd8eb-27d1-7ced-8ca7-dea73dab5558" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_019fd8eb-27d1-7230-8639-949b1d42a18c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019fd8eb-27d1-7020-87c5-63e57cbaf0a7" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_019fd8eb-27d1-7230-8639-949b1d42a18c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedTaxesPayable_019fd8eb-27d1-737e-833a-e455f8ef6dc9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccruedTaxesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019fd8eb-27d1-7020-87c5-63e57cbaf0a7" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedTaxesPayable_019fd8eb-27d1-737e-833a-e455f8ef6dc9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_019fd8eb-27d1-7043-9f6e-44293e7b791a" 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_019fd8eb-27d1-7020-87c5-63e57cbaf0a7" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_019fd8eb-27d1-7043-9f6e-44293e7b791a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_019fd8eb-27d1-7993-91f6-c5f4e48c0b21" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019fd8eb-27d1-7020-87c5-63e57cbaf0a7" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_019fd8eb-27d1-7993-91f6-c5f4e48c0b21" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd8eb-27d1-7d42-a96d-074ea179acec" 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_019fd8eb-27d1-77fa-9795-a7cf08beb72a" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd8eb-27d1-7d42-a96d-074ea179acec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019fd8eb-27d1-7912-af60-bd8ba2cbd94d" 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_019fd8eb-27d1-7b69-94d9-ffd06e3e1496" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019fd8eb-27d1-7912-af60-bd8ba2cbd94d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_019fd8eb-27d1-7b43-a5ac-c4517f767b8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019fd8eb-27d1-7912-af60-bd8ba2cbd94d" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_019fd8eb-27d1-7b43-a5ac-c4517f767b8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_019fd8eb-27d1-7e9a-921a-57de2dc8200d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019fd8eb-27d1-7912-af60-bd8ba2cbd94d" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_019fd8eb-27d1-7e9a-921a-57de2dc8200d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019fd8eb-27d1-737f-bfa3-0f36b149a216" 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_NetCashProvidedByUsedInInvestingActivitiesAbstract_019fd8eb-27d1-7912-af60-bd8ba2cbd94d" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019fd8eb-27d1-737f-bfa3-0f36b149a216" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019fd8eb-27d1-7a61-a371-02ac434a9a6b" 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_019fd8eb-27d1-7912-af60-bd8ba2cbd94d" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019fd8eb-27d1-7a61-a371-02ac434a9a6b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd8eb-27d1-71d1-bfd9-392ad8586c63" 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_019fd8eb-27d1-7912-af60-bd8ba2cbd94d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd8eb-27d1-71d1-bfd9-392ad8586c63" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019fd8eb-27d1-7a6b-9781-ae4582987bd0" 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_019fd8eb-27d1-7b69-94d9-ffd06e3e1496" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019fd8eb-27d1-7a6b-9781-ae4582987bd0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019fd8eb-27d1-7e76-82ce-a89ed51abcc9" 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_019fd8eb-27d1-7a6b-9781-ae4582987bd0" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019fd8eb-27d1-7e76-82ce-a89ed51abcc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_019fd8eb-27d1-7631-85e1-46f8d941cd3e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019fd8eb-27d1-7a6b-9781-ae4582987bd0" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_019fd8eb-27d1-7631-85e1-46f8d941cd3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromConvertibleDebt_01a1383e-bd9c-7fca-89f0-a91cc52cb54f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019fd8eb-27d1-7a6b-9781-ae4582987bd0" xlink:to="loc_us-gaap_ProceedsFromConvertibleDebt_01a1383e-bd9c-7fca-89f0-a91cc52cb54f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019fd8eb-27d1-72aa-8a5b-72d924d35c3d" 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_019fd8eb-27d1-7a6b-9781-ae4582987bd0" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019fd8eb-27d1-72aa-8a5b-72d924d35c3d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_019fd8eb-27d1-726b-91d4-96921e31e0ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019fd8eb-27d1-7a6b-9781-ae4582987bd0" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_019fd8eb-27d1-726b-91d4-96921e31e0ba" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongtermLoansFromVendors_019fd8eb-27d1-73ab-a90e-026051867968" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLongtermLoansFromVendors"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019fd8eb-27d1-7a6b-9781-ae4582987bd0" xlink:to="loc_us-gaap_RepaymentsOfLongtermLoansFromVendors_019fd8eb-27d1-73ab-a90e-026051867968" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd8eb-27d1-7216-b7bc-8575b7058e24" 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_019fd8eb-27d1-7a6b-9781-ae4582987bd0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd8eb-27d1-7216-b7bc-8575b7058e24" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fd8eb-27d1-7cb1-87b0-60e44630fffb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7b69-94d9-ffd06e3e1496" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fd8eb-27d1-7cb1-87b0-60e44630fffb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fd8eb-27d1-7e94-932c-40fb23708d4b" 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_019fd8eb-27d1-7b69-94d9-ffd06e3e1496" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fd8eb-27d1-7e94-932c-40fb23708d4b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fd8eb-27d1-7af1-9bd1-c9c45290a94d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7b69-94d9-ffd06e3e1496" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fd8eb-27d1-7af1-9bd1-c9c45290a94d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fd8eb-27d1-7471-a757-1302cb9d9706" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd8eb-27d1-7b88-85b3-a253df245107" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7b69-94d9-ffd06e3e1496" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd8eb-27d1-7b88-85b3-a253df245107" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_019fd8eb-27d1-78e5-b3f9-1f252bc708da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7b69-94d9-ffd06e3e1496" xlink:to="loc_us-gaap_RestrictedCash_019fd8eb-27d1-78e5-b3f9-1f252bc708da" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fd8eb-27d1-739d-82c9-7eee3b99167b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_01a1a147-293b-702d-808c-154bda1b3b4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fd8eb-27d1-7b69-94d9-ffd06e3e1496" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_01a1a147-293b-702d-808c-154bda1b3b4a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_IssuanceOfDerivativeLiabilityInConnectionWithConvertibleNote_01a1a14c-5274-7fe6-945e-b7eb64fddfe1" xlink:href="svco-20260930.xsd#svco_IssuanceOfDerivativeLiabilityInConnectionWithConvertibleNote"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_01a1a147-293b-702d-808c-154bda1b3b4a" xlink:to="loc_svco_IssuanceOfDerivativeLiabilityInConnectionWithConvertibleNote_01a1a14c-5274-7fe6-945e-b7eb64fddfe1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/SummaryofSignificantAccountingandReportingPoliciesSchedulesofConcentrationofRiskbyRiskFactorDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#SummaryofSignificantAccountingandReportingPoliciesSchedulesofConcentrationofRiskbyRiskFactorDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/SummaryofSignificantAccountingandReportingPoliciesSchedulesofConcentrationofRiskbyRiskFactorDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_svco_AccountingPoliciesLineItems_019fd8eb-27d1-7505-a00d-e231bcc615c4" xlink:href="svco-20260930.xsd#svco_AccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_AccountingPoliciesTable_019fd8eb-27d1-7cb1-a11b-5ec721eeb99f" xlink:href="svco-20260930.xsd#svco_AccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_svco_AccountingPoliciesLineItems_019fd8eb-27d1-7505-a00d-e231bcc615c4" xlink:to="loc_svco_AccountingPoliciesTable_019fd8eb-27d1-7cb1-a11b-5ec721eeb99f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019fd8eb-27d1-7b89-bda6-ce2585bec9f7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_svco_AccountingPoliciesTable_019fd8eb-27d1-7cb1-a11b-5ec721eeb99f" xlink:to="loc_srt_MajorCustomersAxis_019fd8eb-27d1-7b89-bda6-ce2585bec9f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019fd8eb-27d1-7b89-bda6-ce2585bec9f7_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019fd8eb-27d1-7b89-bda6-ce2585bec9f7" xlink:to="loc_srt_NameOfMajorCustomerDomain_019fd8eb-27d1-7b89-bda6-ce2585bec9f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019fd8eb-27d1-7390-b9cf-e341e83559c6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019fd8eb-27d1-7b89-bda6-ce2585bec9f7" xlink:to="loc_srt_NameOfMajorCustomerDomain_019fd8eb-27d1-7390-b9cf-e341e83559c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_CustomerAMember_019fd8eb-27d1-753a-b566-9c456c51c417" xlink:href="svco-20260930.xsd#svco_CustomerAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019fd8eb-27d1-7390-b9cf-e341e83559c6" xlink:to="loc_svco_CustomerAMember_019fd8eb-27d1-753a-b566-9c456c51c417" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_CustomerBMember_019fd8eb-27d1-7ad2-b081-a4a6bf0fdee2" xlink:href="svco-20260930.xsd#svco_CustomerBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019fd8eb-27d1-7390-b9cf-e341e83559c6" xlink:to="loc_svco_CustomerBMember_019fd8eb-27d1-7ad2-b081-a4a6bf0fdee2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_CustomerCMember_019fd8eb-27d1-7852-b18f-15c529e5ea52" xlink:href="svco-20260930.xsd#svco_CustomerCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019fd8eb-27d1-7390-b9cf-e341e83559c6" xlink:to="loc_svco_CustomerCMember_019fd8eb-27d1-7852-b18f-15c529e5ea52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019fd8eb-27d1-7ac9-a246-aba0d0f899d2" 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_svco_AccountingPoliciesTable_019fd8eb-27d1-7cb1-a11b-5ec721eeb99f" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019fd8eb-27d1-7ac9-a246-aba0d0f899d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019fd8eb-27d1-7ac9-a246-aba0d0f899d2_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_019fd8eb-27d1-7ac9-a246-aba0d0f899d2" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019fd8eb-27d1-7ac9-a246-aba0d0f899d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019fd8eb-27d1-71e7-96d8-ad918e3a37f2" 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_019fd8eb-27d1-7ac9-a246-aba0d0f899d2" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019fd8eb-27d1-71e7-96d8-ad918e3a37f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_019fd8eb-27d1-7c5d-8d3e-f13891622354" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019fd8eb-27d1-71e7-96d8-ad918e3a37f2" xlink:to="loc_us-gaap_AccountsReceivableMember_019fd8eb-27d1-7c5d-8d3e-f13891622354" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019fd8eb-27d1-75dc-9428-978678ed04ee" 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_svco_AccountingPoliciesTable_019fd8eb-27d1-7cb1-a11b-5ec721eeb99f" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019fd8eb-27d1-75dc-9428-978678ed04ee" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019fd8eb-27d1-75dc-9428-978678ed04ee_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_019fd8eb-27d1-75dc-9428-978678ed04ee" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019fd8eb-27d1-75dc-9428-978678ed04ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019fd8eb-27d1-7009-a80d-d93081567548" 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_019fd8eb-27d1-75dc-9428-978678ed04ee" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019fd8eb-27d1-7009-a80d-d93081567548" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_019fd8eb-27d1-7cae-9b35-352c40b5082b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019fd8eb-27d1-7009-a80d-d93081567548" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_019fd8eb-27d1-7cae-9b35-352c40b5082b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019fd8eb-27d1-7345-8110-8c906ed0de5a" 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_svco_AccountingPoliciesLineItems_019fd8eb-27d1-7505-a00d-e231bcc615c4" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019fd8eb-27d1-7345-8110-8c906ed0de5a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/SummaryofSignificantAccountingandReportingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#SummaryofSignificantAccountingandReportingPoliciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/SummaryofSignificantAccountingandReportingPoliciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_svco_AccountingPoliciesLineItems_019fd8eb-27d1-7b3c-96bf-91e7fcd4936d" xlink:href="svco-20260930.xsd#svco_AccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_AccountingPoliciesTable_019fd8eb-27d1-7da1-ae90-3ff4d6c9c792" xlink:href="svco-20260930.xsd#svco_AccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_svco_AccountingPoliciesLineItems_019fd8eb-27d1-7b3c-96bf-91e7fcd4936d" xlink:to="loc_svco_AccountingPoliciesTable_019fd8eb-27d1-7da1-ae90-3ff4d6c9c792" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019fd8eb-27d1-762d-8170-1ebc6e5ce57b" 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_svco_AccountingPoliciesTable_019fd8eb-27d1-7da1-ae90-3ff4d6c9c792" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019fd8eb-27d1-762d-8170-1ebc6e5ce57b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019fd8eb-27d1-762d-8170-1ebc6e5ce57b_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_019fd8eb-27d1-762d-8170-1ebc6e5ce57b" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019fd8eb-27d1-762d-8170-1ebc6e5ce57b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019fd8eb-27d1-7ef6-827c-891b06794d73" 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_019fd8eb-27d1-762d-8170-1ebc6e5ce57b" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019fd8eb-27d1-7ef6-827c-891b06794d73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_CashCashEquivalentRestrictedCashAndRestrictedCashEquivalentMember_019fd8eb-27d1-7237-8954-396a392bf1d6" xlink:href="svco-20260930.xsd#svco_CashCashEquivalentRestrictedCashAndRestrictedCashEquivalentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019fd8eb-27d1-7ef6-827c-891b06794d73" xlink:to="loc_svco_CashCashEquivalentRestrictedCashAndRestrictedCashEquivalentMember_019fd8eb-27d1-7237-8954-396a392bf1d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019fd8eb-27d1-78e8-a69a-720cb9320335" 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_svco_AccountingPoliciesTable_019fd8eb-27d1-7da1-ae90-3ff4d6c9c792" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019fd8eb-27d1-78e8-a69a-720cb9320335" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019fd8eb-27d1-78e8-a69a-720cb9320335_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_019fd8eb-27d1-78e8-a69a-720cb9320335" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019fd8eb-27d1-78e8-a69a-720cb9320335_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019fd8eb-27d1-7891-b8b7-72a24776e292" 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_019fd8eb-27d1-78e8-a69a-720cb9320335" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019fd8eb-27d1-7891-b8b7-72a24776e292" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_FinancialInstitutionRiskMember_019fd8eb-27d1-70e8-a93c-4259f922f140" xlink:href="svco-20260930.xsd#svco_FinancialInstitutionRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019fd8eb-27d1-7891-b8b7-72a24776e292" xlink:to="loc_svco_FinancialInstitutionRiskMember_019fd8eb-27d1-70e8-a93c-4259f922f140" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_FinancialInstutionAxis_019fd8eb-27d1-7d8b-8883-fec1dca43e1c" xlink:href="svco-20260930.xsd#svco_FinancialInstutionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_svco_AccountingPoliciesTable_019fd8eb-27d1-7da1-ae90-3ff4d6c9c792" xlink:to="loc_svco_FinancialInstutionAxis_019fd8eb-27d1-7d8b-8883-fec1dca43e1c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_FinancialInstutionDomain_019fd8eb-27d1-7d8b-8883-fec1dca43e1c_default" xlink:href="svco-20260930.xsd#svco_FinancialInstutionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_svco_FinancialInstutionAxis_019fd8eb-27d1-7d8b-8883-fec1dca43e1c" xlink:to="loc_svco_FinancialInstutionDomain_019fd8eb-27d1-7d8b-8883-fec1dca43e1c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_FinancialInstutionDomain_019fd8eb-27d1-79e8-9293-17d29fa3ee14" xlink:href="svco-20260930.xsd#svco_FinancialInstutionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_svco_FinancialInstutionAxis_019fd8eb-27d1-7d8b-8883-fec1dca43e1c" xlink:to="loc_svco_FinancialInstutionDomain_019fd8eb-27d1-79e8-9293-17d29fa3ee14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_TwoFinancialInstitutionsMember_01a177f9-13e9-7ad3-ae67-53165bfcb7ee" xlink:href="svco-20260930.xsd#svco_TwoFinancialInstitutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_svco_FinancialInstutionDomain_019fd8eb-27d1-79e8-9293-17d29fa3ee14" xlink:to="loc_svco_TwoFinancialInstitutionsMember_01a177f9-13e9-7ad3-ae67-53165bfcb7ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019fd8eb-27d1-79ad-bd56-48b5d8803094" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_svco_AccountingPoliciesTable_019fd8eb-27d1-7da1-ae90-3ff4d6c9c792" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019fd8eb-27d1-79ad-bd56-48b5d8803094" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019fd8eb-27d1-79ad-bd56-48b5d8803094_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019fd8eb-27d1-79ad-bd56-48b5d8803094" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019fd8eb-27d1-79ad-bd56-48b5d8803094_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019fd8eb-27d1-7b7c-a6cd-de48a20d0df5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019fd8eb-27d1-79ad-bd56-48b5d8803094" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019fd8eb-27d1-7b7c-a6cd-de48a20d0df5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_ForeignSubsidiariesMember_019fd8eb-27d1-797e-8b8a-e6fb56a375b4" xlink:href="svco-20260930.xsd#svco_ForeignSubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019fd8eb-27d1-7b7c-a6cd-de48a20d0df5" xlink:to="loc_svco_ForeignSubsidiariesMember_019fd8eb-27d1-797e-8b8a-e6fb56a375b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fd8eb-27d1-76b4-9618-9c666a113abd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_svco_AccountingPoliciesLineItems_019fd8eb-27d1-7b3c-96bf-91e7fcd4936d" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fd8eb-27d1-76b4-9618-9c666a113abd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019fd8eb-27d1-7e20-8b9d-6099b6a7a5d2" 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_svco_AccountingPoliciesLineItems_019fd8eb-27d1-7b3c-96bf-91e7fcd4936d" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019fd8eb-27d1-7e20-8b9d-6099b6a7a5d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_019fd8eb-27d1-7cc1-a38b-aff2093c9a57" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_svco_AccountingPoliciesLineItems_019fd8eb-27d1-7b3c-96bf-91e7fcd4936d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_019fd8eb-27d1-7cc1-a38b-aff2093c9a57" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParentBeforeAdjustments_019fd8eb-27d1-769f-a4f5-87ebf5f6baec" xlink:href="svco-20260930.xsd#svco_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParentBeforeAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_svco_AccountingPoliciesLineItems_019fd8eb-27d1-7b3c-96bf-91e7fcd4936d" xlink:to="loc_svco_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParentBeforeAdjustments_019fd8eb-27d1-769f-a4f5-87ebf5f6baec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossAfterTax_019fd8eb-27d1-7aab-b2bc-eea8762aeed1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyTransactionGainLossAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_svco_AccountingPoliciesLineItems_019fd8eb-27d1-7b3c-96bf-91e7fcd4936d" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossAfterTax_019fd8eb-27d1-7aab-b2bc-eea8762aeed1" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/SummaryofSignificantAccountingandReportingPoliciesScheduleofAntidilutiveSecuritiesExcludedfromComputationofDilutedNetLossPerShareDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#SummaryofSignificantAccountingandReportingPoliciesScheduleofAntidilutiveSecuritiesExcludedfromComputationofDilutedNetLossPerShareDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/SummaryofSignificantAccountingandReportingPoliciesScheduleofAntidilutiveSecuritiesExcludedfromComputationofDilutedNetLossPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_svco_AccountingPoliciesLineItems_019fd8eb-27d1-71b2-ace6-2bf523426f36" xlink:href="svco-20260930.xsd#svco_AccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_AccountingPoliciesTable_019fd8eb-27d1-767c-8059-31d6141bd613" xlink:href="svco-20260930.xsd#svco_AccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_svco_AccountingPoliciesLineItems_019fd8eb-27d1-71b2-ace6-2bf523426f36" xlink:to="loc_svco_AccountingPoliciesTable_019fd8eb-27d1-767c-8059-31d6141bd613" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019fd8eb-27d1-785f-9dcb-68c4f9266e35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_svco_AccountingPoliciesTable_019fd8eb-27d1-767c-8059-31d6141bd613" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019fd8eb-27d1-785f-9dcb-68c4f9266e35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019fd8eb-27d1-785f-9dcb-68c4f9266e35_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019fd8eb-27d1-785f-9dcb-68c4f9266e35" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019fd8eb-27d1-785f-9dcb-68c4f9266e35_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019fd8eb-27d1-7f8d-a43c-39830bc6748a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019fd8eb-27d1-785f-9dcb-68c4f9266e35" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019fd8eb-27d1-7f8d-a43c-39830bc6748a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019fd8eb-27d1-7eaf-9c1b-bb523d8a559d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019fd8eb-27d1-7f8d-a43c-39830bc6748a" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019fd8eb-27d1-7eaf-9c1b-bb523d8a559d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_019fd8eb-27d1-7cb8-ab94-3fdf44946045" 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_AntidilutiveSecuritiesNameDomain_019fd8eb-27d1-7f8d-a43c-39830bc6748a" xlink:to="loc_us-gaap_EmployeeStockMember_019fd8eb-27d1-7cb8-ab94-3fdf44946045" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_ContingentlyIssuableShareMember_019fd8eb-27d1-7650-a3d4-53425eba991a" xlink:href="svco-20260930.xsd#svco_ContingentlyIssuableShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019fd8eb-27d1-7f8d-a43c-39830bc6748a" xlink:to="loc_svco_ContingentlyIssuableShareMember_019fd8eb-27d1-7650-a3d4-53425eba991a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019fd8eb-27d1-76ba-94b7-79f3352eb1d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_svco_AccountingPoliciesLineItems_019fd8eb-27d1-71b2-ace6-2bf523426f36" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019fd8eb-27d1-76ba-94b7-79f3352eb1d4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/RevenueDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#RevenueDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/RevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019fd8eb-27d1-7618-8c1a-316829ac0050" 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_019fd8eb-27d1-7b71-9aac-ec98fa2fb704" 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_019fd8eb-27d1-7618-8c1a-316829ac0050" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019fd8eb-27d1-7b71-9aac-ec98fa2fb704" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019fd8eb-27d1-73ec-81f9-35c76af10bee" 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_019fd8eb-27d1-7b71-9aac-ec98fa2fb704" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019fd8eb-27d1-73ec-81f9-35c76af10bee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019fd8eb-27d1-7709-8b76-88a15a60374c" 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_019fd8eb-27d1-7618-8c1a-316829ac0050" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019fd8eb-27d1-7709-8b76-88a15a60374c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019fd8eb-27d1-7a4d-b0b6-b7ce64f2865b" 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_019fd8eb-27d1-7618-8c1a-316829ac0050" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019fd8eb-27d1-7a4d-b0b6-b7ce64f2865b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019fd8eb-27d1-7872-bac5-248d9040bc77" 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_019fd8eb-27d1-7618-8c1a-316829ac0050" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019fd8eb-27d1-7872-bac5-248d9040bc77" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019fd8eb-27d1-779a-a21c-8b529c949bd1" 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_019fd8eb-27d1-7618-8c1a-316829ac0050" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019fd8eb-27d1-779a-a21c-8b529c949bd1" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/RevenueDetails_1" xlink:type="simple" xlink:href="svco-20260930.xsd#RevenueDetails_1"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/RevenueDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019fd8eb-27d1-7618-8c1a-316829ac0050" 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_019fd8eb-27d1-7b71-9aac-ec98fa2fb704" 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_019fd8eb-27d1-7618-8c1a-316829ac0050" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019fd8eb-27d1-7b71-9aac-ec98fa2fb704" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019fd8eb-27d1-7709-8b76-88a15a60374c" 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_019fd8eb-27d1-7618-8c1a-316829ac0050" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019fd8eb-27d1-7709-8b76-88a15a60374c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019fd8eb-27d1-7a4d-b0b6-b7ce64f2865b" 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_019fd8eb-27d1-7618-8c1a-316829ac0050" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019fd8eb-27d1-7a4d-b0b6-b7ce64f2865b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019fd8eb-27d1-7872-bac5-248d9040bc77" 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_019fd8eb-27d1-7618-8c1a-316829ac0050" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019fd8eb-27d1-7872-bac5-248d9040bc77" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019fd8eb-27d1-779a-a21c-8b529c949bd1" 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_019fd8eb-27d1-7618-8c1a-316829ac0050" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019fd8eb-27d1-779a-a21c-8b529c949bd1" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/AcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#AcquisitionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/AcquisitionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-79aa-96be-5898bf57953d" 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_019fd8eb-27d1-7cce-958b-363f5dd30185" 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_019fd8eb-27d1-79aa-96be-5898bf57953d" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019fd8eb-27d1-7cce-958b-363f5dd30185" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019fd8eb-27d1-7139-a8f2-4593ce3a0c0a" 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_019fd8eb-27d1-7cce-958b-363f5dd30185" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019fd8eb-27d1-7139-a8f2-4593ce3a0c0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7139-a8f2-4593ce3a0c0a_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_019fd8eb-27d1-7139-a8f2-4593ce3a0c0a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7139-a8f2-4593ce3a0c0a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7c36-ae36-b59d8e566960" 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_019fd8eb-27d1-7139-a8f2-4593ce3a0c0a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7c36-ae36-b59d8e566960" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_OpticalProximityCorrectionSuiteOfToolsOPCBusinessMember_019fd8eb-27d1-7e2f-b0d7-ae348530e266" xlink:href="svco-20260930.xsd#svco_OpticalProximityCorrectionSuiteOfToolsOPCBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7c36-ae36-b59d8e566960" xlink:to="loc_svco_OpticalProximityCorrectionSuiteOfToolsOPCBusinessMember_019fd8eb-27d1-7e2f-b0d7-ae348530e266" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_TechXCorporationTechXMember_019fd8eb-27d1-7baa-9cd6-8b149444557d" xlink:href="svco-20260930.xsd#svco_TechXCorporationTechXMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7c36-ae36-b59d8e566960" xlink:to="loc_svco_TechXCorporationTechXMember_019fd8eb-27d1-7baa-9cd6-8b149444557d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_MixelGroupInc.MixelMember_01a0a9c1-51f9-7ed3-be84-ad7f2df8cbd9" xlink:href="svco-20260930.xsd#svco_MixelGroupInc.MixelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7c36-ae36-b59d8e566960" xlink:to="loc_svco_MixelGroupInc.MixelMember_01a0a9c1-51f9-7ed3-be84-ad7f2df8cbd9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019fd8eb-27d1-7759-9b15-cf697080eab7" 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_019fd8eb-27d1-79aa-96be-5898bf57953d" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019fd8eb-27d1-7759-9b15-cf697080eab7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019fd8eb-27d1-7851-aa59-2ebfb9927855" 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_019fd8eb-27d1-79aa-96be-5898bf57953d" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019fd8eb-27d1-7851-aa59-2ebfb9927855" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019fd8eb-27d1-7826-a910-a1dcf13f55cf" 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_019fd8eb-27d1-79aa-96be-5898bf57953d" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019fd8eb-27d1-7826-a910-a1dcf13f55cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_019fd8eb-27d1-718c-aa1e-5a75094ba427" 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_BusinessAcquisitionLineItems_019fd8eb-27d1-79aa-96be-5898bf57953d" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_019fd8eb-27d1-718c-aa1e-5a75094ba427" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_019fd8eb-27d1-7fea-bcbc-d4e4165fe200" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-79aa-96be-5898bf57953d" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_019fd8eb-27d1-7fea-bcbc-d4e4165fe200" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_BusinessCombinationContingentConsiderationMaximumPayout_019fd8eb-27d1-7501-8eb3-f2fc5d0dbc73" xlink:href="svco-20260930.xsd#svco_BusinessCombinationContingentConsiderationMaximumPayout"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-79aa-96be-5898bf57953d" xlink:to="loc_svco_BusinessCombinationContingentConsiderationMaximumPayout_019fd8eb-27d1-7501-8eb3-f2fc5d0dbc73" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019fd8eb-27d1-74aa-b83c-566fe4f258fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-79aa-96be-5898bf57953d" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019fd8eb-27d1-74aa-b83c-566fe4f258fc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityIssuedInBusinessCombinationFairValueDisclosure_019fd8eb-27d1-73b9-a949-adaee488e549" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityIssuedInBusinessCombinationFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-79aa-96be-5898bf57953d" xlink:to="loc_us-gaap_EquityIssuedInBusinessCombinationFairValueDisclosure_019fd8eb-27d1-73b9-a949-adaee488e549" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_01a177ef-b806-723a-a032-9d8d35b4d1a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-79aa-96be-5898bf57953d" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_01a177ef-b806-723a-a032-9d8d35b4d1a4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_01a08b85-6048-7715-9331-97466b536f5c" 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_019fd8eb-27d1-79aa-96be-5898bf57953d" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_01a08b85-6048-7715-9331-97466b536f5c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_01a15d22-1eed-7f28-95bb-0c9f53b83203" 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_BusinessAcquisitionLineItems_019fd8eb-27d1-79aa-96be-5898bf57953d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_01a15d22-1eed-7f28-95bb-0c9f53b83203" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/AcquisitionsAssetsAcquiredAndLiabilitiesAssumedOpticalProximityCorrectionSuiteofToolsDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#AcquisitionsAssetsAcquiredAndLiabilitiesAssumedOpticalProximityCorrectionSuiteofToolsDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/AcquisitionsAssetsAcquiredAndLiabilitiesAssumedOpticalProximityCorrectionSuiteofToolsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-7438-9c7e-ecf3a25d13b4" 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_019fd8eb-27d1-7900-9813-1143f3bb033a" 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_019fd8eb-27d1-7438-9c7e-ecf3a25d13b4" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019fd8eb-27d1-7900-9813-1143f3bb033a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019fd8eb-27d1-7db7-8707-978db14a5900" 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_019fd8eb-27d1-7900-9813-1143f3bb033a" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019fd8eb-27d1-7db7-8707-978db14a5900" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7db7-8707-978db14a5900_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_019fd8eb-27d1-7db7-8707-978db14a5900" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7db7-8707-978db14a5900_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7496-acbf-2f2cd7c59198" 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_019fd8eb-27d1-7db7-8707-978db14a5900" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7496-acbf-2f2cd7c59198" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_OpticalProximityCorrectionSuiteOfToolsOPCBusinessMember_019fd8eb-27d1-7dbb-a0ba-4997e16d725f" xlink:href="svco-20260930.xsd#svco_OpticalProximityCorrectionSuiteOfToolsOPCBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7496-acbf-2f2cd7c59198" xlink:to="loc_svco_OpticalProximityCorrectionSuiteOfToolsOPCBusinessMember_019fd8eb-27d1-7dbb-a0ba-4997e16d725f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019fd8eb-27d1-7fc8-a523-fa219ae224cc" 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_019fd8eb-27d1-7900-9813-1143f3bb033a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019fd8eb-27d1-7fc8-a523-fa219ae224cc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-7fc8-a523-fa219ae224cc_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_019fd8eb-27d1-7fc8-a523-fa219ae224cc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-7fc8-a523-fa219ae224cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-72ea-891d-fe0b1f93d428" 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_019fd8eb-27d1-7fc8-a523-fa219ae224cc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-72ea-891d-fe0b1f93d428" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_019fd8eb-27d1-7276-b24d-01d98af3c9d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-72ea-891d-fe0b1f93d428" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_019fd8eb-27d1-7276-b24d-01d98af3c9d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019fd8eb-27d1-7329-939a-68665cb8c7f5" 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_019fd8eb-27d1-72ea-891d-fe0b1f93d428" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019fd8eb-27d1-7329-939a-68665cb8c7f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019fd8eb-27d1-76d2-92d0-8cf0694d8d49" 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_019fd8eb-27d1-7438-9c7e-ecf3a25d13b4" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019fd8eb-27d1-76d2-92d0-8cf0694d8d49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_BusinessCombinationRecognizedAssetAcquiredContractWithCustomer_019fd8eb-27d1-7bb7-b7ec-f3184daacbaf" xlink:href="svco-20260930.xsd#svco_BusinessCombinationRecognizedAssetAcquiredContractWithCustomer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-7438-9c7e-ecf3a25d13b4" xlink:to="loc_svco_BusinessCombinationRecognizedAssetAcquiredContractWithCustomer_019fd8eb-27d1-7bb7-b7ec-f3184daacbaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_019fd8eb-27d1-7128-bbfd-abf5bb560011" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-7438-9c7e-ecf3a25d13b4" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_019fd8eb-27d1-7128-bbfd-abf5bb560011" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019fd8eb-27d1-7807-8e66-28394472cf5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-7438-9c7e-ecf3a25d13b4" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019fd8eb-27d1-7807-8e66-28394472cf5f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019fd8eb-27d1-78da-aa65-4d1bb3f59690" 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_BusinessAcquisitionLineItems_019fd8eb-27d1-7438-9c7e-ecf3a25d13b4" xlink:to="loc_us-gaap_Goodwill_019fd8eb-27d1-78da-aa65-4d1bb3f59690" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_019fd8eb-27d1-76de-a63e-fa1734615891" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-7438-9c7e-ecf3a25d13b4" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_019fd8eb-27d1-76de-a63e-fa1734615891" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019fd8eb-27d1-7fa1-8204-d032960ee456" 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_BusinessAcquisitionLineItems_019fd8eb-27d1-7438-9c7e-ecf3a25d13b4" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019fd8eb-27d1-7fa1-8204-d032960ee456" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/AcquisitionsAssetsAcquiredAndLiabilitiesAssumedTechXCorporationDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#AcquisitionsAssetsAcquiredAndLiabilitiesAssumedTechXCorporationDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/AcquisitionsAssetsAcquiredAndLiabilitiesAssumedTechXCorporationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" 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_019fd8eb-27d1-75c9-b368-ff4c718b1e7b" 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_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019fd8eb-27d1-75c9-b368-ff4c718b1e7b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019fd8eb-27d1-7169-802c-dcf93c03d0ca" 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_019fd8eb-27d1-75c9-b368-ff4c718b1e7b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019fd8eb-27d1-7169-802c-dcf93c03d0ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7169-802c-dcf93c03d0ca_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_019fd8eb-27d1-7169-802c-dcf93c03d0ca" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7169-802c-dcf93c03d0ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7f28-9ac8-cf2e42767b04" 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_019fd8eb-27d1-7169-802c-dcf93c03d0ca" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7f28-9ac8-cf2e42767b04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_TechXCorporationTechXMember_019fd8eb-27d1-7dab-846a-5cf0eedfa37f" xlink:href="svco-20260930.xsd#svco_TechXCorporationTechXMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd8eb-27d1-7f28-9ac8-cf2e42767b04" xlink:to="loc_svco_TechXCorporationTechXMember_019fd8eb-27d1-7dab-846a-5cf0eedfa37f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019fd8eb-27d1-7bcf-bc87-e9aff0bb626f" 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_019fd8eb-27d1-75c9-b368-ff4c718b1e7b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019fd8eb-27d1-7bcf-bc87-e9aff0bb626f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-7bcf-bc87-e9aff0bb626f_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_019fd8eb-27d1-7bcf-bc87-e9aff0bb626f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-7bcf-bc87-e9aff0bb626f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-7068-a944-41056e1886e4" 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_019fd8eb-27d1-7bcf-bc87-e9aff0bb626f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-7068-a944-41056e1886e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019fd8eb-27d1-7fda-b631-43df668815c3" 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_019fd8eb-27d1-7068-a944-41056e1886e4" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019fd8eb-27d1-7fda-b631-43df668815c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_019fd8eb-27d1-74f3-ae73-ae3469ba8a6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-7068-a944-41056e1886e4" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_019fd8eb-27d1-74f3-ae73-ae3469ba8a6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019fd8eb-27d1-7023-b6a9-08b882f18bd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-7068-a944-41056e1886e4" xlink:to="loc_us-gaap_TradeNamesMember_019fd8eb-27d1-7023-b6a9-08b882f18bd8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019fd8eb-27d1-720c-9748-1f52bfab4adb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019fd8eb-27d1-720c-9748-1f52bfab4adb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_019fd8eb-27d1-7a3d-abe9-c8f66e3235fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_019fd8eb-27d1-7a3d-abe9-c8f66e3235fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_019fd8eb-27d1-7a3a-8bf2-8755fdedd1a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_019fd8eb-27d1-7a3a-8bf2-8755fdedd1a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019fd8eb-27d1-7d24-81b5-044ff2ec1b6a" 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_BusinessAcquisitionLineItems_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019fd8eb-27d1-7d24-81b5-044ff2ec1b6a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019fd8eb-27d1-7cc5-a083-5d4ebf44a61a" 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_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019fd8eb-27d1-7cc5-a083-5d4ebf44a61a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019fd8eb-27d1-7682-8988-a37b2449eb0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019fd8eb-27d1-7682-8988-a37b2449eb0d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019fd8eb-27d1-7c0d-b16c-ab7518aa2009" 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_BusinessAcquisitionLineItems_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_Goodwill_019fd8eb-27d1-7c0d-b16c-ab7518aa2009" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_019fd8eb-27d1-7148-b629-e502c1f22b86" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_019fd8eb-27d1-7148-b629-e502c1f22b86" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_019fd8eb-27d1-7a4f-98e6-41717cd5356f" 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_BusinessAcquisitionLineItems_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_019fd8eb-27d1-7a4f-98e6-41717cd5356f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019fd8eb-27d1-7883-88e7-623a7ff821f3" 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_BusinessAcquisitionLineItems_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019fd8eb-27d1-7883-88e7-623a7ff821f3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_019fd8eb-27d1-7aee-9b93-f8ffb96bc1e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_019fd8eb-27d1-7aee-9b93-f8ffb96bc1e0" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019fd8eb-27d1-7d17-a9aa-0c8876c88f0a" 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_BusinessAcquisitionLineItems_019fd8eb-27d1-7c79-a0a2-f377f4caf42b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019fd8eb-27d1-7d17-a9aa-0c8876c88f0a" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/AcquisitionsMixelGroupIncDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#AcquisitionsMixelGroupIncDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/AcquisitionsMixelGroupIncDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" 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_01a08b5f-078d-79ae-9ca3-40652fa82bcd" 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_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a08b5f-078d-79ae-9ca3-40652fa82bcd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a08b5f-078d-744c-ac9c-53ec314d278d" 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_01a08b5f-078d-79ae-9ca3-40652fa82bcd" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a08b5f-078d-744c-ac9c-53ec314d278d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a08b5f-078d-744c-ac9c-53ec314d278d_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_01a08b5f-078d-744c-ac9c-53ec314d278d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a08b5f-078d-744c-ac9c-53ec314d278d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a08b5f-078d-7504-a823-9bb74ee94914" 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_01a08b5f-078d-744c-ac9c-53ec314d278d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a08b5f-078d-7504-a823-9bb74ee94914" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_MixelGroupInc.MixelMember_01a08b5f-078d-7ccb-8425-c2edf94ca9dc" xlink:href="svco-20260930.xsd#svco_MixelGroupInc.MixelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a08b5f-078d-7504-a823-9bb74ee94914" xlink:to="loc_svco_MixelGroupInc.MixelMember_01a08b5f-078d-7ccb-8425-c2edf94ca9dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a08b5f-078d-7f30-9d20-815b61a615fb" 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_01a08b5f-078d-79ae-9ca3-40652fa82bcd" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a08b5f-078d-7f30-9d20-815b61a615fb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a08b5f-078d-7f30-9d20-815b61a615fb_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_01a08b5f-078d-7f30-9d20-815b61a615fb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a08b5f-078d-7f30-9d20-815b61a615fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a08b5f-078d-75cb-9dd0-471b9635e2f1" 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_01a08b5f-078d-7f30-9d20-815b61a615fb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a08b5f-078d-75cb-9dd0-471b9635e2f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_01a08b5f-078d-7d72-9508-b4d6744e379d" 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_01a08b5f-078d-75cb-9dd0-471b9635e2f1" xlink:to="loc_us-gaap_CustomerRelationshipsMember_01a08b5f-078d-7d72-9508-b4d6744e379d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_01a08b5f-078d-74c0-aa9e-10bd8a9c1aa0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a08b5f-078d-75cb-9dd0-471b9635e2f1" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_01a08b5f-078d-74c0-aa9e-10bd8a9c1aa0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_01a08b5f-078d-7a00-8549-1ca5c02bbad7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a08b5f-078d-75cb-9dd0-471b9635e2f1" xlink:to="loc_us-gaap_TradeNamesMember_01a08b5f-078d-7a00-8549-1ca5c02bbad7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_01a08b5f-078d-7e34-a1ae-eb7e70d84ca5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_01a08b5f-078d-7e34-a1ae-eb7e70d84ca5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_01a08b5f-078d-757e-bfeb-ec22776abfe0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_01a08b5f-078d-757e-bfeb-ec22776abfe0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_BusinessCombinationRecognizedAssetAcquiredContractWithCustomer_01a0effc-60bf-791f-9d36-7fe2bf95310b" xlink:href="svco-20260930.xsd#svco_BusinessCombinationRecognizedAssetAcquiredContractWithCustomer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_svco_BusinessCombinationRecognizedAssetAcquiredContractWithCustomer_01a0effc-60bf-791f-9d36-7fe2bf95310b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_01a08b5f-078d-7c4d-afbf-8351444ec8ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_01a08b5f-078d-7c4d-afbf-8351444ec8ae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_01a08b5f-078d-7033-9267-957f9a3a1ecc" 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_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_01a08b5f-078d-7033-9267-957f9a3a1ecc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_01a08b5f-078d-7f25-9984-f9713167ab3c" 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_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_01a08b5f-078d-7f25-9984-f9713167ab3c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_01a08b5f-078d-7a0f-b1d4-8df97ebb6dfc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_01a08b5f-078d-7a0f-b1d4-8df97ebb6dfc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_BusinessCombinationRecognizedAssetAcquiredOperatingLeaseRightOfUseAssetsNet_01a0a9b6-cae4-78d7-aed5-f2a6937749cd" xlink:href="svco-20260930.xsd#svco_BusinessCombinationRecognizedAssetAcquiredOperatingLeaseRightOfUseAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_svco_BusinessCombinationRecognizedAssetAcquiredOperatingLeaseRightOfUseAssetsNet_01a0a9b6-cae4-78d7-aed5-f2a6937749cd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_01a0a9b6-2dd6-7e2b-ae3f-d81187f48fd5" 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_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_01a0a9b6-2dd6-7e2b-ae3f-d81187f48fd5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_01a08b5f-078d-76a0-a4d5-e57c60f5026c" 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_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_Goodwill_01a08b5f-078d-76a0-a4d5-e57c60f5026c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_01a08b5f-078d-7f69-b9d0-1a5570cf01d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_01a08b5f-078d-7f69-b9d0-1a5570cf01d2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_01a08b5f-078d-7614-a3f8-bf7e4f3af940" 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_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_01a08b5f-078d-7614-a3f8-bf7e4f3af940" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_01a0efe6-a842-707e-b171-50835c2fc2cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_01a0efe6-a842-707e-b171-50835c2fc2cc" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_01a0a9bb-92d1-7a42-a15b-08091356c036" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_01a0a9bb-92d1-7a42-a15b-08091356c036" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_01a08b5f-078d-77ff-afe9-ea64677266cd" 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_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_01a08b5f-078d-77ff-afe9-ea64677266cd" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_BusinessCombinationRecognizedLiabilityAssumedLeaseObligationNoncurrent_01a0efe9-9cd3-7e22-954a-447e50440ece" xlink:href="svco-20260930.xsd#svco_BusinessCombinationRecognizedLiabilityAssumedLeaseObligationNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_svco_BusinessCombinationRecognizedLiabilityAssumedLeaseObligationNoncurrent_01a0efe9-9cd3-7e22-954a-447e50440ece" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_01a08b5f-078d-746d-a13b-5769cfd003a8" 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_BusinessAcquisitionLineItems_01a08b5f-078d-74c0-a28e-a1048d6ac88e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_01a08b5f-078d-746d-a13b-5769cfd003a8" xlink:type="arc" order="16"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/RestructuringNarrativeDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#RestructuringNarrativeDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/RestructuringNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019fd8eb-27d1-7d2f-9d25-db590a4b804d" 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_019fd8eb-27d1-7ab1-97b9-60b44de250d8" 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_019fd8eb-27d1-7d2f-9d25-db590a4b804d" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019fd8eb-27d1-7ab1-97b9-60b44de250d8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019fd8eb-27d1-70a3-bc74-7cf718b6db6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019fd8eb-27d1-7ab1-97b9-60b44de250d8" xlink:to="loc_us-gaap_RestructuringPlanAxis_019fd8eb-27d1-70a3-bc74-7cf718b6db6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019fd8eb-27d1-70a3-bc74-7cf718b6db6d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019fd8eb-27d1-70a3-bc74-7cf718b6db6d" xlink:to="loc_us-gaap_RestructuringPlanDomain_019fd8eb-27d1-70a3-bc74-7cf718b6db6d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019fd8eb-27d1-7e5b-bdfd-65b495c668e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019fd8eb-27d1-70a3-bc74-7cf718b6db6d" xlink:to="loc_us-gaap_RestructuringPlanDomain_019fd8eb-27d1-7e5b-bdfd-65b495c668e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_A2025RestructuringPlanMember_019fd8eb-27d1-7857-862d-bc71a8504732" xlink:href="svco-20260930.xsd#svco_A2025RestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019fd8eb-27d1-7e5b-bdfd-65b495c668e0" xlink:to="loc_svco_A2025RestructuringPlanMember_019fd8eb-27d1-7857-862d-bc71a8504732" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_019fd8eb-27d1-7228-a450-4dcfaf3aca4d" 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_019fd8eb-27d1-7d2f-9d25-db590a4b804d" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_019fd8eb-27d1-7228-a450-4dcfaf3aca4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_019fd8eb-27d1-72c3-8d4d-418ea498b09f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019fd8eb-27d1-7d2f-9d25-db590a4b804d" xlink:to="loc_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_019fd8eb-27d1-72c3-8d4d-418ea498b09f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_019fd8eb-27d1-7003-bf0d-b7e9f67d7cea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringAndRelatedCostIncurredCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019fd8eb-27d1-7d2f-9d25-db590a4b804d" xlink:to="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_019fd8eb-27d1-7003-bf0d-b7e9f67d7cea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_019fd8eb-27d1-7674-895d-d2c45435aefd" 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_019fd8eb-27d1-7d2f-9d25-db590a4b804d" xlink:to="loc_us-gaap_RestructuringReserve_019fd8eb-27d1-7674-895d-d2c45435aefd" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/RestructuringScheduleofRestructuringReserveDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#RestructuringScheduleofRestructuringReserveDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/RestructuringScheduleofRestructuringReserveDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019fd8eb-27d1-7331-a120-19b1740d0f27" 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_019fd8eb-27d1-7cca-b909-7660e6c8ea5f" 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_019fd8eb-27d1-7331-a120-19b1740d0f27" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019fd8eb-27d1-7cca-b909-7660e6c8ea5f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_019fd8eb-27d1-799b-888a-bdedd022e6de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019fd8eb-27d1-7cca-b909-7660e6c8ea5f" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_019fd8eb-27d1-799b-888a-bdedd022e6de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019fd8eb-27d1-799b-888a-bdedd022e6de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019fd8eb-27d1-799b-888a-bdedd022e6de" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019fd8eb-27d1-799b-888a-bdedd022e6de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019fd8eb-27d1-7f07-995c-75604593fa1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019fd8eb-27d1-799b-888a-bdedd022e6de" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019fd8eb-27d1-7f07-995c-75604593fa1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_019fd8eb-27d1-76bc-8214-fb3d38208e05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019fd8eb-27d1-7f07-995c-75604593fa1c" xlink:to="loc_us-gaap_EmployeeSeveranceMember_019fd8eb-27d1-76bc-8214-fb3d38208e05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_019fd8eb-27d1-7b7f-987e-ec223ebe92ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019fd8eb-27d1-7f07-995c-75604593fa1c" xlink:to="loc_us-gaap_OtherRestructuringMember_019fd8eb-27d1-7b7f-987e-ec223ebe92ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_019fd8eb-27d1-7347-b145-028b29ee5cf5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019fd8eb-27d1-7331-a120-19b1740d0f27" xlink:to="loc_us-gaap_RestructuringReserveRollForward_019fd8eb-27d1-7347-b145-028b29ee5cf5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_019fd8eb-27d1-717c-9c2a-9c95d553e8db" 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_RestructuringReserveRollForward_019fd8eb-27d1-7347-b145-028b29ee5cf5" xlink:to="loc_us-gaap_RestructuringReserve_019fd8eb-27d1-717c-9c2a-9c95d553e8db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019fd8eb-27d1-74bb-99a0-d9cd3bb6f2a3" 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_RestructuringReserveRollForward_019fd8eb-27d1-7347-b145-028b29ee5cf5" xlink:to="loc_us-gaap_RestructuringCharges_019fd8eb-27d1-74bb-99a0-d9cd3bb6f2a3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_019fd8eb-27d1-77d2-9194-9cebda38e2ea" 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_RestructuringReserveRollForward_019fd8eb-27d1-7347-b145-028b29ee5cf5" xlink:to="loc_us-gaap_PaymentsForRestructuring_019fd8eb-27d1-77d2-9194-9cebda38e2ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveSettledWithoutCash2_019fd8eb-27d1-7543-9c0a-dda26a3f6603" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserveSettledWithoutCash2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019fd8eb-27d1-7347-b145-028b29ee5cf5" xlink:to="loc_us-gaap_RestructuringReserveSettledWithoutCash2_019fd8eb-27d1-7543-9c0a-dda26a3f6603" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_019fd8eb-27d1-7a7f-9eca-a1c58091c1d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserve"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/RestructuringScheduleofRestructuringExpensesDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#RestructuringScheduleofRestructuringExpensesDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/RestructuringScheduleofRestructuringExpensesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019fd8eb-27d1-704b-a476-fd7bd39a9f27" 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_019fd8eb-27d1-7cd6-a11d-d7fdccab8122" 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_019fd8eb-27d1-704b-a476-fd7bd39a9f27" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019fd8eb-27d1-7cd6-a11d-d7fdccab8122" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019fd8eb-27d1-7a2b-8caf-eb8acc9144f7" 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_ScheduleOfRestructuringAndRelatedCostsTable_019fd8eb-27d1-7cd6-a11d-d7fdccab8122" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019fd8eb-27d1-7a2b-8caf-eb8acc9144f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019fd8eb-27d1-73ec-951b-a48c80d21cb1" 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_019fd8eb-27d1-704b-a476-fd7bd39a9f27" xlink:to="loc_us-gaap_RestructuringCharges_019fd8eb-27d1-73ec-951b-a48c80d21cb1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/RestructuringScheduleofRestructuringExpensesDetails_1" xlink:type="simple" xlink:href="svco-20260930.xsd#RestructuringScheduleofRestructuringExpensesDetails_1"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/RestructuringScheduleofRestructuringExpensesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019fd8eb-27d1-704b-a476-fd7bd39a9f27" 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_019fd8eb-27d1-7cd6-a11d-d7fdccab8122" 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_019fd8eb-27d1-704b-a476-fd7bd39a9f27" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019fd8eb-27d1-7cd6-a11d-d7fdccab8122" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019fd8eb-27d1-73ec-951b-a48c80d21cb1" 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_019fd8eb-27d1-704b-a476-fd7bd39a9f27" xlink:to="loc_us-gaap_RestructuringCharges_019fd8eb-27d1-73ec-951b-a48c80d21cb1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/IntangibleAssetsScheduleofFiniteLivedIntangibleAssetsDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#IntangibleAssetsScheduleofFiniteLivedIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/IntangibleAssetsScheduleofFiniteLivedIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019fd8eb-27d1-741f-84d7-f256f407b6d8" 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_019fd8eb-27d1-7a49-a8cc-144b289b88c4" 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_019fd8eb-27d1-741f-84d7-f256f407b6d8" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019fd8eb-27d1-7a49-a8cc-144b289b88c4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019fd8eb-27d1-72c7-9f79-5bcf684b5d90" 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_019fd8eb-27d1-7a49-a8cc-144b289b88c4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019fd8eb-27d1-72c7-9f79-5bcf684b5d90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-72c7-9f79-5bcf684b5d90_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_019fd8eb-27d1-72c7-9f79-5bcf684b5d90" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-72c7-9f79-5bcf684b5d90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-715d-aeed-68df118718be" 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_019fd8eb-27d1-72c7-9f79-5bcf684b5d90" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-715d-aeed-68df118718be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_019fd8eb-27d1-7056-95b0-be462e1230f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-715d-aeed-68df118718be" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_019fd8eb-27d1-7056-95b0-be462e1230f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019fd8eb-27d1-7bf2-9275-e2e5eb1fbf27" 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_019fd8eb-27d1-715d-aeed-68df118718be" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019fd8eb-27d1-7bf2-9275-e2e5eb1fbf27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019fd8eb-27d1-75c0-91fe-a7d93a5d106e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-715d-aeed-68df118718be" xlink:to="loc_us-gaap_TradeNamesMember_019fd8eb-27d1-75c0-91fe-a7d93a5d106e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_019fd8eb-27d1-7c60-b11b-26a1ab4eacf6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncompeteAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-715d-aeed-68df118718be" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_019fd8eb-27d1-7c60-b11b-26a1ab4eacf6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntellectualPropertyMember_019fd8eb-27d1-718a-bbc8-81d0caeedb8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntellectualPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-715d-aeed-68df118718be" xlink:to="loc_us-gaap_IntellectualPropertyMember_019fd8eb-27d1-718a-bbc8-81d0caeedb8e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019fd8eb-27d1-77e8-8479-7d6ea47ec1f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019fd8eb-27d1-741f-84d7-f256f407b6d8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019fd8eb-27d1-77e8-8479-7d6ea47ec1f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019fd8eb-27d1-7595-9203-46043ca2a30e" 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_019fd8eb-27d1-741f-84d7-f256f407b6d8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019fd8eb-27d1-7595-9203-46043ca2a30e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019fd8eb-27d1-745f-ba49-ca6a17f01a23" 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_019fd8eb-27d1-741f-84d7-f256f407b6d8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019fd8eb-27d1-745f-ba49-ca6a17f01a23" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019fd8eb-27d1-7b4a-aaad-677091e020ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019fd8eb-27d1-741f-84d7-f256f407b6d8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019fd8eb-27d1-7b4a-aaad-677091e020ea" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/IntangibleAssetsNarrativeDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#IntangibleAssetsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/IntangibleAssetsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019fd8eb-27d1-7989-abb3-d14b0ee0e150" 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_019fd8eb-27d1-7b0d-890f-e1e47287d3ce" 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_019fd8eb-27d1-7989-abb3-d14b0ee0e150" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019fd8eb-27d1-7b0d-890f-e1e47287d3ce" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019fd8eb-27d1-7833-ad27-a96bb2ddd048" 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_019fd8eb-27d1-7b0d-890f-e1e47287d3ce" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019fd8eb-27d1-7833-ad27-a96bb2ddd048" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019fd8eb-27d1-7833-ad27-a96bb2ddd048_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_019fd8eb-27d1-7833-ad27-a96bb2ddd048" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019fd8eb-27d1-7833-ad27-a96bb2ddd048_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019fd8eb-27d1-715d-a7c3-a89546b5b0f9" 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_019fd8eb-27d1-7833-ad27-a96bb2ddd048" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019fd8eb-27d1-715d-a7c3-a89546b5b0f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember_019fd8eb-27d1-7649-b1d7-a9cb2f169e68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019fd8eb-27d1-715d-a7c3-a89546b5b0f9" xlink:to="loc_us-gaap_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember_019fd8eb-27d1-7649-b1d7-a9cb2f169e68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets_019fd8eb-27d1-7151-993f-5ba5fc312213" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019fd8eb-27d1-7989-abb3-d14b0ee0e150" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets_019fd8eb-27d1-7151-993f-5ba5fc312213" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/IntangibleAssetsScheduleofAmortizationofIntangibleAssetsDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#IntangibleAssetsScheduleofAmortizationofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/IntangibleAssetsScheduleofAmortizationofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019fd8eb-27d1-77ee-aaba-b2119afd32f5" 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_019fd8eb-27d1-79b1-a011-f1de8f1ec537" 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_019fd8eb-27d1-77ee-aaba-b2119afd32f5" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019fd8eb-27d1-79b1-a011-f1de8f1ec537" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019fd8eb-27d1-7164-849e-62b02548776c" 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_ScheduleOfFiniteLivedIntangibleAssetsTable_019fd8eb-27d1-79b1-a011-f1de8f1ec537" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019fd8eb-27d1-7164-849e-62b02548776c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019fd8eb-27d1-74a6-b118-48580c55f725" 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_FiniteLivedIntangibleAssetsLineItems_019fd8eb-27d1-77ee-aaba-b2119afd32f5" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019fd8eb-27d1-74a6-b118-48580c55f725" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/IntangibleAssetsScheduleofAmortizationofIntangibleAssetsDetails_1" xlink:type="simple" xlink:href="svco-20260930.xsd#IntangibleAssetsScheduleofAmortizationofIntangibleAssetsDetails_1"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/IntangibleAssetsScheduleofAmortizationofIntangibleAssetsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019fd8eb-27d1-77ee-aaba-b2119afd32f5" 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_019fd8eb-27d1-79b1-a011-f1de8f1ec537" 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_019fd8eb-27d1-77ee-aaba-b2119afd32f5" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019fd8eb-27d1-79b1-a011-f1de8f1ec537" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019fd8eb-27d1-74a6-b118-48580c55f725" 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_FiniteLivedIntangibleAssetsLineItems_019fd8eb-27d1-77ee-aaba-b2119afd32f5" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019fd8eb-27d1-74a6-b118-48580c55f725" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/RelatedPartiesDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#RelatedPartiesDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/RelatedPartiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019fd8eb-27d1-73b4-89c3-c03da480f058" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019fd8eb-27d1-7fd2-a716-5f7436db34aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019fd8eb-27d1-73b4-89c3-c03da480f058" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019fd8eb-27d1-7fd2-a716-5f7436db34aa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019fd8eb-27d1-7120-a7d1-5aa0367ee4f9" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019fd8eb-27d1-7fd2-a716-5f7436db34aa" xlink:to="loc_srt_CounterpartyNameAxis_019fd8eb-27d1-7120-a7d1-5aa0367ee4f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fd8eb-27d1-7120-a7d1-5aa0367ee4f9_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019fd8eb-27d1-7120-a7d1-5aa0367ee4f9" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fd8eb-27d1-7120-a7d1-5aa0367ee4f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fd8eb-27d1-71b8-a883-d69dee7184b7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019fd8eb-27d1-7120-a7d1-5aa0367ee4f9" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fd8eb-27d1-71b8-a883-d69dee7184b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_KipeeInternationalIncMember_019fd8eb-27d1-719c-a2ed-b220398a4827" xlink:href="svco-20260930.xsd#svco_KipeeInternationalIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fd8eb-27d1-71b8-a883-d69dee7184b7" xlink:to="loc_svco_KipeeInternationalIncMember_019fd8eb-27d1-719c-a2ed-b220398a4827" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_NewHorizonsCambridgeLTDNHCMember_019fd8eb-27d1-723f-a983-c73ed8a5fcc1" xlink:href="svco-20260930.xsd#svco_NewHorizonsCambridgeLTDNHCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fd8eb-27d1-71b8-a883-d69dee7184b7" xlink:to="loc_svco_NewHorizonsCambridgeLTDNHCMember_019fd8eb-27d1-723f-a983-c73ed8a5fcc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019fd8eb-27d1-7768-a09e-3d1f51a8e21a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019fd8eb-27d1-7fd2-a716-5f7436db34aa" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019fd8eb-27d1-7768-a09e-3d1f51a8e21a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019fd8eb-27d1-7768-a09e-3d1f51a8e21a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019fd8eb-27d1-7768-a09e-3d1f51a8e21a" xlink:to="loc_us-gaap_RelatedPartyDomain_019fd8eb-27d1-7768-a09e-3d1f51a8e21a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019fd8eb-27d1-72e4-9ae4-da9cf824ef75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019fd8eb-27d1-7768-a09e-3d1f51a8e21a" xlink:to="loc_us-gaap_RelatedPartyDomain_019fd8eb-27d1-72e4-9ae4-da9cf824ef75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019fd8eb-27d1-7556-b817-a78b7c1b3dfb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019fd8eb-27d1-72e4-9ae4-da9cf824ef75" xlink:to="loc_us-gaap_RelatedPartyMember_019fd8eb-27d1-7556-b817-a78b7c1b3dfb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_019fd8eb-27d1-732d-8058-64ae056077cc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019fd8eb-27d1-7fd2-a716-5f7436db34aa" xlink:to="loc_srt_LitigationCaseAxis_019fd8eb-27d1-732d-8058-64ae056077cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019fd8eb-27d1-732d-8058-64ae056077cc_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_019fd8eb-27d1-732d-8058-64ae056077cc" xlink:to="loc_srt_LitigationCaseTypeDomain_019fd8eb-27d1-732d-8058-64ae056077cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019fd8eb-27d1-706b-a0fd-d8117d07aa09" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_019fd8eb-27d1-732d-8058-64ae056077cc" xlink:to="loc_srt_LitigationCaseTypeDomain_019fd8eb-27d1-706b-a0fd-d8117d07aa09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_NangatePartiesCrossComplaintMember_019fd8eb-27d1-777e-a321-08df96903b4f" xlink:href="svco-20260930.xsd#svco_NangatePartiesCrossComplaintMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_019fd8eb-27d1-706b-a0fd-d8117d07aa09" xlink:to="loc_svco_NangatePartiesCrossComplaintMember_019fd8eb-27d1-777e-a321-08df96903b4f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019fd8eb-27d1-7d7e-b7ac-b9920938ea9c" 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_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019fd8eb-27d1-7fd2-a716-5f7436db34aa" xlink:to="loc_dei_LegalEntityAxis_019fd8eb-27d1-7d7e-b7ac-b9920938ea9c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019fd8eb-27d1-7d7e-b7ac-b9920938ea9c_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_019fd8eb-27d1-7d7e-b7ac-b9920938ea9c" xlink:to="loc_dei_EntityDomain_019fd8eb-27d1-7d7e-b7ac-b9920938ea9c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019fd8eb-27d1-7bd6-a5b2-081595a28675" 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_019fd8eb-27d1-7d7e-b7ac-b9920938ea9c" xlink:to="loc_dei_EntityDomain_019fd8eb-27d1-7bd6-a5b2-081595a28675" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_SilvacoGroupInc.AndCoDefendantsMember_019fd8eb-27d1-70af-8d25-b14d9d5cc626" xlink:href="svco-20260930.xsd#svco_SilvacoGroupInc.AndCoDefendantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019fd8eb-27d1-7bd6-a5b2-081595a28675" xlink:to="loc_svco_SilvacoGroupInc.AndCoDefendantsMember_019fd8eb-27d1-70af-8d25-b14d9d5cc626" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_CoDefendantsMember_019fd8eb-27d1-74a1-9021-363987c26bbc" xlink:href="svco-20260930.xsd#svco_CoDefendantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019fd8eb-27d1-7bd6-a5b2-081595a28675" xlink:to="loc_svco_CoDefendantsMember_019fd8eb-27d1-74a1-9021-363987c26bbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseExpense_019fd8eb-27d1-7a60-97f7-d4e98bfaa62c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019fd8eb-27d1-73b4-89c3-c03da480f058" xlink:to="loc_us-gaap_OperatingLeaseExpense_019fd8eb-27d1-7a60-97f7-d4e98bfaa62c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019fd8eb-27d1-7ced-8974-a3e188b58423" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019fd8eb-27d1-73b4-89c3-c03da480f058" xlink:to="loc_us-gaap_OperatingLeaseLiability_019fd8eb-27d1-7ced-8974-a3e188b58423" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019fd8eb-27d1-78c1-be64-65328529ca31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019fd8eb-27d1-73b4-89c3-c03da480f058" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019fd8eb-27d1-78c1-be64-65328529ca31" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForLegalSettlements_019fd8eb-27d1-7e68-9fd3-232bcd6dd59e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForLegalSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019fd8eb-27d1-73b4-89c3-c03da480f058" xlink:to="loc_us-gaap_PaymentsForLegalSettlements_019fd8eb-27d1-7e68-9fd3-232bcd6dd59e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_LegalSettlementApportionmentAgreementPercentageOfSettlementPaymentAgreedToBear_019fd8eb-27d1-7c6e-becb-50342c4d378c" xlink:href="svco-20260930.xsd#svco_LegalSettlementApportionmentAgreementPercentageOfSettlementPaymentAgreedToBear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019fd8eb-27d1-73b4-89c3-c03da480f058" xlink:to="loc_svco_LegalSettlementApportionmentAgreementPercentageOfSettlementPaymentAgreedToBear_019fd8eb-27d1-7c6e-becb-50342c4d378c" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/DebtandFinancingObligationsNarrativeDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#DebtandFinancingObligationsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/DebtandFinancingObligationsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" 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_019fd8eb-27d1-76cb-bf4a-dfec15b1354f" 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_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_us-gaap_DebtInstrumentTable_019fd8eb-27d1-76cb-bf4a-dfec15b1354f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a12f3c-026d-72d2-8e74-ad6d1bed52f8" 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_019fd8eb-27d1-76cb-bf4a-dfec15b1354f" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a12f3c-026d-72d2-8e74-ad6d1bed52f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a12f3c-026d-72d2-8e74-ad6d1bed52f8_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_01a12f3c-026d-72d2-8e74-ad6d1bed52f8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a12f3c-026d-72d2-8e74-ad6d1bed52f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a12f3c-026d-7f6d-b565-94686a92057d" 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_01a12f3c-026d-72d2-8e74-ad6d1bed52f8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a12f3c-026d-7f6d-b565-94686a92057d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_01a12f3c-026d-73fc-81a4-81aba086d0f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a12f3c-026d-7f6d-b565-94686a92057d" xlink:to="loc_us-gaap_ConvertibleDebtMember_01a12f3c-026d-73fc-81a4-81aba086d0f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_DebtInstrumentConvertibleTermsOfConversionAxis_01a12f3c-026d-7688-a545-227d18c6ecb6" xlink:href="svco-20260930.xsd#svco_DebtInstrumentConvertibleTermsOfConversionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019fd8eb-27d1-76cb-bf4a-dfec15b1354f" xlink:to="loc_svco_DebtInstrumentConvertibleTermsOfConversionAxis_01a12f3c-026d-7688-a545-227d18c6ecb6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_DebtInstrumentConvertibleTermsOfConversionDomain_01a12f3c-026d-7688-a545-227d18c6ecb6_default" xlink:href="svco-20260930.xsd#svco_DebtInstrumentConvertibleTermsOfConversionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_svco_DebtInstrumentConvertibleTermsOfConversionAxis_01a12f3c-026d-7688-a545-227d18c6ecb6" xlink:to="loc_svco_DebtInstrumentConvertibleTermsOfConversionDomain_01a12f3c-026d-7688-a545-227d18c6ecb6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_DebtInstrumentConvertibleTermsOfConversionDomain_01a12f3c-026d-7f24-acdc-c53a62471b0f" xlink:href="svco-20260930.xsd#svco_DebtInstrumentConvertibleTermsOfConversionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_svco_DebtInstrumentConvertibleTermsOfConversionAxis_01a12f3c-026d-7688-a545-227d18c6ecb6" xlink:to="loc_svco_DebtInstrumentConvertibleTermsOfConversionDomain_01a12f3c-026d-7f24-acdc-c53a62471b0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_DebtConversionTermsOneMember_01a12f3c-026d-7c59-9aa0-148005598a57" xlink:href="svco-20260930.xsd#svco_DebtConversionTermsOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_svco_DebtInstrumentConvertibleTermsOfConversionDomain_01a12f3c-026d-7f24-acdc-c53a62471b0f" xlink:to="loc_svco_DebtConversionTermsOneMember_01a12f3c-026d-7c59-9aa0-148005598a57" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_DebtConversionTermsTwoMember_01a12f3c-026d-7c9d-9319-3f46c069aa2d" xlink:href="svco-20260930.xsd#svco_DebtConversionTermsTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_svco_DebtInstrumentConvertibleTermsOfConversionDomain_01a12f3c-026d-7f24-acdc-c53a62471b0f" xlink:to="loc_svco_DebtConversionTermsTwoMember_01a12f3c-026d-7c9d-9319-3f46c069aa2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019fd8eb-27d1-700a-adc2-8afe1a00a0fc" 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_DebtInstrumentTable_019fd8eb-27d1-76cb-bf4a-dfec15b1354f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019fd8eb-27d1-700a-adc2-8afe1a00a0fc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-700a-adc2-8afe1a00a0fc_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_019fd8eb-27d1-700a-adc2-8afe1a00a0fc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-700a-adc2-8afe1a00a0fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-7655-b9ab-cf96c5c0ddd0" 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_019fd8eb-27d1-700a-adc2-8afe1a00a0fc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-7655-b9ab-cf96c5c0ddd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntellectualPropertyMember_019fd8eb-27d1-7a59-be1b-a529a1cac314" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntellectualPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019fd8eb-27d1-7655-b9ab-cf96c5c0ddd0" xlink:to="loc_us-gaap_IntellectualPropertyMember_019fd8eb-27d1-7a59-be1b-a529a1cac314" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_01a18319-8e23-7a0d-a6c4-119b356fc90f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019fd8eb-27d1-76cb-bf4a-dfec15b1354f" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_01a18319-8e23-7a0d-a6c4-119b356fc90f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a18319-8e23-7a0d-a6c4-119b356fc90f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_01a18319-8e23-7a0d-a6c4-119b356fc90f" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a18319-8e23-7a0d-a6c4-119b356fc90f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a18319-8e23-7cf9-9372-0948bf954099" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_01a18319-8e23-7a0d-a6c4-119b356fc90f" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a18319-8e23-7cf9-9372-0948bf954099" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_01a18319-8e23-727e-b509-58f74726f27c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a18319-8e23-7cf9-9372-0948bf954099" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_01a18319-8e23-727e-b509-58f74726f27c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_01a12f3c-026d-729c-9f26-48ef6ca934e7" 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_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_01a12f3c-026d-729c-9f26-48ef6ca934e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_01a12f3c-026d-746c-b85f-86bc85d04587" 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_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_01a12f3c-026d-746c-b85f-86bc85d04587" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_01a12f3c-026d-758d-a6f0-8cef7aa01619" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_01a12f3c-026d-758d-a6f0-8cef7aa01619" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_DebtInstrumentConvertibleConversionPriceReductionPerUncompletedProjectBasisPoints_01a1788c-0365-7cb9-ae14-5d095402dc08" xlink:href="svco-20260930.xsd#svco_DebtInstrumentConvertibleConversionPriceReductionPerUncompletedProjectBasisPoints"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_svco_DebtInstrumentConvertibleConversionPriceReductionPerUncompletedProjectBasisPoints_01a1788c-0365-7cb9-ae14-5d095402dc08" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_01a1831d-65dc-74f6-9e7b-058f6978ffcd" 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_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_01a1831d-65dc-74f6-9e7b-058f6978ffcd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_01a1831f-9152-7411-a24b-9a744c93a899" 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_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_us-gaap_LongTermDebt_01a1831f-9152-7411-a24b-9a744c93a899" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_01a1879b-1041-7c3f-9be4-644a4aaafe92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_01a1879b-1041-7c3f-9be4-644a4aaafe92" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_01a18977-0dc6-7833-95f8-31595e78be32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_01a18977-0dc6-7833-95f8-31595e78be32" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_FiniteLivedIntangibleAssetTotalCashConsiderationToBePaid_019fd8eb-2884-721a-8512-d261c2348623" xlink:href="svco-20260930.xsd#svco_FiniteLivedIntangibleAssetTotalCashConsiderationToBePaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_svco_FiniteLivedIntangibleAssetTotalCashConsiderationToBePaid_019fd8eb-2884-721a-8512-d261c2348623" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_FiniteLivedIntangibleAssetConsiderationPaymentPeriod_019fd8eb-2884-7c79-9ce2-50431d6ad056" xlink:href="svco-20260930.xsd#svco_FiniteLivedIntangibleAssetConsiderationPaymentPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_svco_FiniteLivedIntangibleAssetConsiderationPaymentPeriod_019fd8eb-2884-7c79-9ce2-50431d6ad056" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplierFinanceProgramObligation_019fd8eb-2884-7bc7-baac-279ee81e0740" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplierFinanceProgramObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_us-gaap_SupplierFinanceProgramObligation_019fd8eb-2884-7bc7-baac-279ee81e0740" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_SupplierFinanceProgramObligationImputedInterestRate_019fd8eb-2884-7996-a8aa-35e3e2b28853" xlink:href="svco-20260930.xsd#svco_SupplierFinanceProgramObligationImputedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_svco_SupplierFinanceProgramObligationImputedInterestRate_019fd8eb-2884-7996-a8aa-35e3e2b28853" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_InterestExpenseSupplierFinanceObligation_019fd8eb-2884-7506-ae06-32885a6efcda" xlink:href="svco-20260930.xsd#svco_InterestExpenseSupplierFinanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fd8eb-27d1-779b-b6d2-6fd2b9a8102c" xlink:to="loc_svco_InterestExpenseSupplierFinanceObligation_019fd8eb-2884-7506-ae06-32885a6efcda" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/StockBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#StockBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019fd8eb-2884-7ab9-94f6-0b897c5ac270" 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_019fd8eb-2884-7e3f-bb4f-444fed28e107" 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_019fd8eb-2884-7ab9-94f6-0b897c5ac270" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019fd8eb-2884-7e3f-bb4f-444fed28e107" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019fd8eb-2884-7d04-8002-ba7ce104e06d" 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_019fd8eb-2884-7e3f-bb4f-444fed28e107" xlink:to="loc_us-gaap_AwardTypeAxis_019fd8eb-2884-7d04-8002-ba7ce104e06d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019fd8eb-2884-7d04-8002-ba7ce104e06d_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_019fd8eb-2884-7d04-8002-ba7ce104e06d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019fd8eb-2884-7d04-8002-ba7ce104e06d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019fd8eb-2884-76e0-be02-2e55d4370788" 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_019fd8eb-2884-7d04-8002-ba7ce104e06d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019fd8eb-2884-76e0-be02-2e55d4370788" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019fd8eb-2884-782e-974b-9992c62a6d59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019fd8eb-2884-76e0-be02-2e55d4370788" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019fd8eb-2884-782e-974b-9992c62a6d59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019fd8eb-2884-7bd0-b8b9-a890b026356d" 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_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019fd8eb-2884-7e3f-bb4f-444fed28e107" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019fd8eb-2884-7bd0-b8b9-a890b026356d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019fd8eb-2884-7bd0-b8b9-a890b026356d_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_019fd8eb-2884-7bd0-b8b9-a890b026356d" xlink:to="loc_us-gaap_EquityComponentDomain_019fd8eb-2884-7bd0-b8b9-a890b026356d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019fd8eb-2884-771c-953b-0c4a49c75606" 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_019fd8eb-2884-7bd0-b8b9-a890b026356d" xlink:to="loc_us-gaap_EquityComponentDomain_019fd8eb-2884-771c-953b-0c4a49c75606" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019fd8eb-2884-7422-92d6-9ef51df916c7" 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_EquityComponentDomain_019fd8eb-2884-771c-953b-0c4a49c75606" xlink:to="loc_us-gaap_CommonStockMember_019fd8eb-2884-7422-92d6-9ef51df916c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAcceleratedVestingNumber_019fd8eb-2884-7b65-809c-8edcc72118c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAcceleratedVestingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019fd8eb-2884-7ab9-94f6-0b897c5ac270" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAcceleratedVestingNumber_019fd8eb-2884-7b65-809c-8edcc72118c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019fd8eb-2884-7291-8767-3b0abcbc6c82" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019fd8eb-2884-7ab9-94f6-0b897c5ac270" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019fd8eb-2884-7291-8767-3b0abcbc6c82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_019fd8eb-2884-750b-8629-66a29ac8c212" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019fd8eb-2884-7ab9-94f6-0b897c5ac270" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_019fd8eb-2884-750b-8629-66a29ac8c212" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019fd8eb-2884-79f3-abdc-1eef2cad3d2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019fd8eb-2884-7ab9-94f6-0b897c5ac270" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019fd8eb-2884-79f3-abdc-1eef2cad3d2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_019fd8eb-2884-79c6-95e7-7ecf31207ed3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019fd8eb-2884-7ab9-94f6-0b897c5ac270" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_019fd8eb-2884-79c6-95e7-7ecf31207ed3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019fd8eb-2884-703b-bc42-00fd6131ec96" 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_019fd8eb-2884-7ab9-94f6-0b897c5ac270" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019fd8eb-2884-703b-bc42-00fd6131ec96" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/StockBasedCompensationScheduleofShareBasedPaymentArrangementExpensedandCapitalizedAmountDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#StockBasedCompensationScheduleofShareBasedPaymentArrangementExpensedandCapitalizedAmountDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/StockBasedCompensationScheduleofShareBasedPaymentArrangementExpensedandCapitalizedAmountDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019fd8eb-2884-70ba-9503-ce3042715563" 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_019fd8eb-2884-735a-91d3-3e00f84c45bd" 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_019fd8eb-2884-70ba-9503-ce3042715563" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019fd8eb-2884-735a-91d3-3e00f84c45bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019fd8eb-2884-720f-b925-ab52b3f9fe8b" 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_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019fd8eb-2884-735a-91d3-3e00f84c45bd" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019fd8eb-2884-720f-b925-ab52b3f9fe8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019fd8eb-2884-7b28-82ae-aeb37826bdb7" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019fd8eb-2884-70ba-9503-ce3042715563" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019fd8eb-2884-7b28-82ae-aeb37826bdb7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/StockBasedCompensationScheduleofShareBasedPaymentArrangementExpensedandCapitalizedAmountDetails_1" xlink:type="simple" xlink:href="svco-20260930.xsd#StockBasedCompensationScheduleofShareBasedPaymentArrangementExpensedandCapitalizedAmountDetails_1"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/StockBasedCompensationScheduleofShareBasedPaymentArrangementExpensedandCapitalizedAmountDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019fd8eb-2884-70ba-9503-ce3042715563" 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_019fd8eb-2884-735a-91d3-3e00f84c45bd" 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_019fd8eb-2884-70ba-9503-ce3042715563" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019fd8eb-2884-735a-91d3-3e00f84c45bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019fd8eb-2884-7b28-82ae-aeb37826bdb7" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019fd8eb-2884-70ba-9503-ce3042715563" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019fd8eb-2884-7b28-82ae-aeb37826bdb7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/SegmentReportingScheduleofReconciliationofOperatingProfitLossfromSegmentstoConsolidatedDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#SegmentReportingScheduleofReconciliationofOperatingProfitLossfromSegmentstoConsolidatedDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/SegmentReportingScheduleofReconciliationofOperatingProfitLossfromSegmentstoConsolidatedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019fd8eb-2884-772b-9d86-753e855e8fc2" 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_019fd8eb-2884-7d25-a05e-db5d47efd89d" 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_019fd8eb-2884-772b-9d86-753e855e8fc2" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019fd8eb-2884-7d25-a05e-db5d47efd89d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019fd8eb-2884-74ed-8e91-e407bfaecd54" 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_019fd8eb-2884-7d25-a05e-db5d47efd89d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019fd8eb-2884-74ed-8e91-e407bfaecd54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019fd8eb-2884-74ed-8e91-e407bfaecd54_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_019fd8eb-2884-74ed-8e91-e407bfaecd54" xlink:to="loc_us-gaap_SegmentDomain_019fd8eb-2884-74ed-8e91-e407bfaecd54_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019fd8eb-2884-7524-a977-ca21620b9782" 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_019fd8eb-2884-74ed-8e91-e407bfaecd54" xlink:to="loc_us-gaap_SegmentDomain_019fd8eb-2884-7524-a977-ca21620b9782" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_ReportableSegmentMember_019fd8eb-2884-7bb7-b254-fe6e00a6cdba" xlink:href="svco-20260930.xsd#svco_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019fd8eb-2884-7524-a977-ca21620b9782" xlink:to="loc_svco_ReportableSegmentMember_019fd8eb-2884-7bb7-b254-fe6e00a6cdba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019fd8eb-2884-7815-ab95-774682c3d2cd" 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_019fd8eb-2884-772b-9d86-753e855e8fc2" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019fd8eb-2884-7815-ab95-774682c3d2cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalariesWagesAndOfficersCompensation_019fd8eb-2884-7380-ac21-fd35fbb67edf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalariesWagesAndOfficersCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8eb-2884-772b-9d86-753e855e8fc2" xlink:to="loc_us-gaap_SalariesWagesAndOfficersCompensation_019fd8eb-2884-7380-ac21-fd35fbb67edf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpenses_019fd8eb-2884-79c2-87fb-a82b640e59db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8eb-2884-772b-9d86-753e855e8fc2" xlink:to="loc_us-gaap_OtherExpenses_019fd8eb-2884-79c2-87fb-a82b640e59db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_019fd8eb-2884-7603-addd-6291d116cd8a" 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_019fd8eb-2884-772b-9d86-753e855e8fc2" xlink:to="loc_us-gaap_CostsAndExpenses_019fd8eb-2884-7603-addd-6291d116cd8a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fd8eb-2884-75fc-b19e-7e7695c38616" 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_SegmentReportingInformationLineItems_019fd8eb-2884-772b-9d86-753e855e8fc2" xlink:to="loc_us-gaap_NetIncomeLoss_019fd8eb-2884-75fc-b19e-7e7695c38616" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#CommitmentsandContingenciesDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/CommitmentsandContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019fd8eb-2884-742f-b53a-a20102eaeb2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019fd8eb-2884-7a6b-b5e8-9292e54d8b2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019fd8eb-2884-742f-b53a-a20102eaeb2f" xlink:to="loc_us-gaap_LossContingenciesTable_019fd8eb-2884-7a6b-b5e8-9292e54d8b2d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019fd8eb-2884-7280-9307-b9e600aebab2" 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_LossContingenciesTable_019fd8eb-2884-7a6b-b5e8-9292e54d8b2d" xlink:to="loc_srt_ProductOrServiceAxis_019fd8eb-2884-7280-9307-b9e600aebab2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019fd8eb-2884-7280-9307-b9e600aebab2_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_019fd8eb-2884-7280-9307-b9e600aebab2" xlink:to="loc_srt_ProductsAndServicesDomain_019fd8eb-2884-7280-9307-b9e600aebab2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019fd8eb-2884-72ab-8e57-130f761dbe41" 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_019fd8eb-2884-7280-9307-b9e600aebab2" xlink:to="loc_srt_ProductsAndServicesDomain_019fd8eb-2884-72ab-8e57-130f761dbe41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_SoftwareLicensesMember_019fd8eb-2884-7dea-817d-c13a1d6eb9e9" xlink:href="svco-20260930.xsd#svco_SoftwareLicensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019fd8eb-2884-72ab-8e57-130f761dbe41" xlink:to="loc_svco_SoftwareLicensesMember_019fd8eb-2884-7dea-817d-c13a1d6eb9e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_OtherToolsMember_019fd8eb-2884-7aea-985f-c358d3db9e36" xlink:href="svco-20260930.xsd#svco_OtherToolsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019fd8eb-2884-72ab-8e57-130f761dbe41" xlink:to="loc_svco_OtherToolsMember_019fd8eb-2884-7aea-985f-c358d3db9e36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_019fd8eb-2884-78fd-988b-f59a77b6940a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019fd8eb-2884-7a6b-b5e8-9292e54d8b2d" xlink:to="loc_srt_LitigationCaseAxis_019fd8eb-2884-78fd-988b-f59a77b6940a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019fd8eb-2884-78fd-988b-f59a77b6940a_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_019fd8eb-2884-78fd-988b-f59a77b6940a" xlink:to="loc_srt_LitigationCaseTypeDomain_019fd8eb-2884-78fd-988b-f59a77b6940a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019fd8eb-2884-7a3a-93cd-0c4abd9b01c5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_019fd8eb-2884-78fd-988b-f59a77b6940a" xlink:to="loc_srt_LitigationCaseTypeDomain_019fd8eb-2884-7a3a-93cd-0c4abd9b01c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_NangatePartiesCrossComplaintMember_019fd8eb-2884-78e9-aebc-96887a303983" xlink:href="svco-20260930.xsd#svco_NangatePartiesCrossComplaintMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_019fd8eb-2884-7a3a-93cd-0c4abd9b01c5" xlink:to="loc_svco_NangatePartiesCrossComplaintMember_019fd8eb-2884-78e9-aebc-96887a303983" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019fd8eb-2884-78ef-b4db-aecb28de82b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019fd8eb-2884-7a6b-b5e8-9292e54d8b2d" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019fd8eb-2884-78ef-b4db-aecb28de82b9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019fd8eb-2884-78ef-b4db-aecb28de82b9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019fd8eb-2884-78ef-b4db-aecb28de82b9" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019fd8eb-2884-78ef-b4db-aecb28de82b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019fd8eb-2884-702d-8f1e-54c8d54314bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019fd8eb-2884-78ef-b4db-aecb28de82b9" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019fd8eb-2884-702d-8f1e-54c8d54314bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_FraudDamagesExcludingPunitiveDamagesMember_019fd8eb-2884-77a9-a3e0-edec5d7b62e3" xlink:href="svco-20260930.xsd#svco_FraudDamagesExcludingPunitiveDamagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019fd8eb-2884-702d-8f1e-54c8d54314bb" xlink:to="loc_svco_FraudDamagesExcludingPunitiveDamagesMember_019fd8eb-2884-77a9-a3e0-edec5d7b62e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_PunitiveDamagesMember_019fd8eb-2884-7bdf-be03-2ece413846bb" xlink:href="svco-20260930.xsd#svco_PunitiveDamagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019fd8eb-2884-702d-8f1e-54c8d54314bb" xlink:to="loc_svco_PunitiveDamagesMember_019fd8eb-2884-7bdf-be03-2ece413846bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019fd8eb-2884-7656-829a-bf18c46d6b74" 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_LossContingenciesTable_019fd8eb-2884-7a6b-b5e8-9292e54d8b2d" xlink:to="loc_dei_LegalEntityAxis_019fd8eb-2884-7656-829a-bf18c46d6b74" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019fd8eb-2884-7656-829a-bf18c46d6b74_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_019fd8eb-2884-7656-829a-bf18c46d6b74" xlink:to="loc_dei_EntityDomain_019fd8eb-2884-7656-829a-bf18c46d6b74_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019fd8eb-2884-7113-a311-6f6798c16190" 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_019fd8eb-2884-7656-829a-bf18c46d6b74" xlink:to="loc_dei_EntityDomain_019fd8eb-2884-7113-a311-6f6798c16190" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_SilvacoGroupInc.Member_019fd8eb-2884-7108-b3b5-4d3789e7ce55" xlink:href="svco-20260930.xsd#svco_SilvacoGroupInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019fd8eb-2884-7113-a311-6f6798c16190" xlink:to="loc_svco_SilvacoGroupInc.Member_019fd8eb-2884-7108-b3b5-4d3789e7ce55" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_CoDefendantsMember_019fd8eb-2884-73c3-8f3d-9866ac9ca645" xlink:href="svco-20260930.xsd#svco_CoDefendantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019fd8eb-2884-7113-a311-6f6798c16190" xlink:to="loc_svco_CoDefendantsMember_019fd8eb-2884-73c3-8f3d-9866ac9ca645" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_StandardProductWarrantyTerm_019fd8eb-2884-78f5-8288-27049ca81084" xlink:href="svco-20260930.xsd#svco_StandardProductWarrantyTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019fd8eb-2884-742f-b53a-a20102eaeb2f" xlink:to="loc_svco_StandardProductWarrantyTerm_019fd8eb-2884-78f5-8288-27049ca81084" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_019fd8eb-2884-7276-8775-731fe4e467d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyDamagesSoughtValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019fd8eb-2884-742f-b53a-a20102eaeb2f" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_019fd8eb-2884-7276-8775-731fe4e467d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyDamagesAwardedValue_019fd8eb-2884-7fbc-a1a6-0b15c18cecc8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyDamagesAwardedValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019fd8eb-2884-742f-b53a-a20102eaeb2f" xlink:to="loc_us-gaap_LossContingencyDamagesAwardedValue_019fd8eb-2884-7fbc-a1a6-0b15c18cecc8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyLossInPeriod_019fd8eb-2884-70dc-ac19-1450e2723fd0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyLossInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019fd8eb-2884-742f-b53a-a20102eaeb2f" xlink:to="loc_us-gaap_LossContingencyLossInPeriod_019fd8eb-2884-70dc-ac19-1450e2723fd0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForLegalSettlements_019fd8eb-2884-725d-afc4-d0fdc4192d39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForLegalSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019fd8eb-2884-742f-b53a-a20102eaeb2f" xlink:to="loc_us-gaap_PaymentsForLegalSettlements_019fd8eb-2884-725d-afc4-d0fdc4192d39" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/FairValueofFinancialInstrumentsScheduleofFairValueLiabilitiesMeasuredonRecurringBasisDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#FairValueofFinancialInstrumentsScheduleofFairValueLiabilitiesMeasuredonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/FairValueofFinancialInstrumentsScheduleofFairValueLiabilitiesMeasuredonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019fd8eb-2884-76c1-9325-315a8c99bfd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019fd8eb-2884-721f-a642-e6d22769b235" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019fd8eb-2884-76c1-9325-315a8c99bfd8" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019fd8eb-2884-721f-a642-e6d22769b235" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019fd8eb-2884-71d3-80e0-ff27318f3d03" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019fd8eb-2884-721f-a642-e6d22769b235" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019fd8eb-2884-71d3-80e0-ff27318f3d03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019fd8eb-2884-71d3-80e0-ff27318f3d03_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_019fd8eb-2884-71d3-80e0-ff27318f3d03" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019fd8eb-2884-71d3-80e0-ff27318f3d03_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019fd8eb-2884-7a8c-b8d1-065d175836fe" 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_019fd8eb-2884-71d3-80e0-ff27318f3d03" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019fd8eb-2884-7a8c-b8d1-065d175836fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019fd8eb-2884-7cc7-afc7-72d3116397f0" 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_019fd8eb-2884-7a8c-b8d1-065d175836fe" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019fd8eb-2884-7cc7-afc7-72d3116397f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019fd8eb-2884-7680-9b53-6bef57a1f678" 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_019fd8eb-2884-7a8c-b8d1-065d175836fe" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019fd8eb-2884-7680-9b53-6bef57a1f678" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019fd8eb-2884-74b9-b55e-d456738932a0" 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_019fd8eb-2884-7a8c-b8d1-065d175836fe" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019fd8eb-2884-74b9-b55e-d456738932a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_019fd8eb-2884-71ef-aa0b-31b76f62271a" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019fd8eb-2884-721f-a642-e6d22769b235" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_019fd8eb-2884-71ef-aa0b-31b76f62271a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019fd8eb-2884-71ef-aa0b-31b76f62271a_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_019fd8eb-2884-71ef-aa0b-31b76f62271a" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019fd8eb-2884-71ef-aa0b-31b76f62271a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019fd8eb-2884-7fcd-a7d6-a9820678cbc5" 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_019fd8eb-2884-71ef-aa0b-31b76f62271a" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019fd8eb-2884-7fcd-a7d6-a9820678cbc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_019fd8eb-2884-7114-b44b-0d7d6aa75f2e" 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_019fd8eb-2884-7fcd-a7d6-a9820678cbc5" xlink:to="loc_us-gaap_MoneyMarketFundsMember_019fd8eb-2884-7114-b44b-0d7d6aa75f2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019fd8eb-2884-77b3-bd99-3445a614553c" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019fd8eb-2884-721f-a642-e6d22769b235" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019fd8eb-2884-77b3-bd99-3445a614553c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019fd8eb-2884-77b3-bd99-3445a614553c_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_019fd8eb-2884-77b3-bd99-3445a614553c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019fd8eb-2884-77b3-bd99-3445a614553c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019fd8eb-2884-76e8-b6fe-bdfebb8ad889" 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_019fd8eb-2884-77b3-bd99-3445a614553c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019fd8eb-2884-76e8-b6fe-bdfebb8ad889" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019fd8eb-2884-709f-8a38-102b3db67a9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019fd8eb-2884-76e8-b6fe-bdfebb8ad889" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019fd8eb-2884-709f-8a38-102b3db67a9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_01a18974-1a72-7381-8584-b025bb313a18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019fd8eb-2884-721f-a642-e6d22769b235" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_01a18974-1a72-7381-8584-b025bb313a18" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a18974-1a72-7381-8584-b025bb313a18_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_01a18974-1a72-7381-8584-b025bb313a18" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a18974-1a72-7381-8584-b025bb313a18_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a18974-1a72-7df6-b1e1-180d6caeff26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_01a18974-1a72-7381-8584-b025bb313a18" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a18974-1a72-7df6-b1e1-180d6caeff26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_01a18974-1a72-7c2e-96c1-31e622f6decb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a18974-1a72-7df6-b1e1-180d6caeff26" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_01a18974-1a72-7c2e-96c1-31e622f6decb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019fd8eb-2884-73d8-a4d2-06bf35261726" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019fd8eb-2884-76c1-9325-315a8c99bfd8" xlink:to="loc_us-gaap_AssetsAbstract_019fd8eb-2884-73d8-a4d2-06bf35261726" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019fd8eb-2884-77af-ab17-a69c34d262bc" 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_AssetsAbstract_019fd8eb-2884-73d8-a4d2-06bf35261726" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019fd8eb-2884-77af-ab17-a69c34d262bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019fd8eb-2884-7e67-ba2c-90eab6734464" 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_AssetsAbstract_019fd8eb-2884-73d8-a4d2-06bf35261726" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019fd8eb-2884-7e67-ba2c-90eab6734464" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019fd8eb-2884-7646-b4fa-01fd3dc724d2" 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_AssetsAbstract_019fd8eb-2884-73d8-a4d2-06bf35261726" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019fd8eb-2884-7646-b4fa-01fd3dc724d2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019fd8eb-2884-735a-b66c-8099192cb666" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019fd8eb-2884-76c1-9325-315a8c99bfd8" xlink:to="loc_us-gaap_LiabilitiesAbstract_019fd8eb-2884-735a-b66c-8099192cb666" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019fd8eb-2884-7ecd-b402-dda038f407a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019fd8eb-2884-735a-b66c-8099192cb666" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019fd8eb-2884-7ecd-b402-dda038f407a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_01a13902-6770-7ee2-990f-a6fbe2e9d854" 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_LiabilitiesAbstract_019fd8eb-2884-735a-b66c-8099192cb666" xlink:to="loc_us-gaap_DerivativeLiabilities_01a13902-6770-7ee2-990f-a6fbe2e9d854" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019fd8eb-2884-7fb1-9860-65dca6a4728e" 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_LiabilitiesAbstract_019fd8eb-2884-735a-b66c-8099192cb666" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019fd8eb-2884-7fb1-9860-65dca6a4728e" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/FairValueofFinancialInstrumentsScheduleofFairValueLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#FairValueofFinancialInstrumentsScheduleofFairValueLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/FairValueofFinancialInstrumentsScheduleofFairValueLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a179d6-e9d0-74a1-8870-5a17034184de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a179d6-e9d0-7e8d-929e-0d2092691963" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a179d6-e9d0-74a1-8870-5a17034184de" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a179d6-e9d0-7e8d-929e-0d2092691963" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_01a179d6-e9d0-7888-9037-b5a7cb8fef73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a179d6-e9d0-7e8d-929e-0d2092691963" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_01a179d6-e9d0-7888-9037-b5a7cb8fef73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a179d6-e9d0-7888-9037-b5a7cb8fef73_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_01a179d6-e9d0-7888-9037-b5a7cb8fef73" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a179d6-e9d0-7888-9037-b5a7cb8fef73_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a179d6-e9d0-7cc8-9b29-bb8d226a9331" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_01a179d6-e9d0-7888-9037-b5a7cb8fef73" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a179d6-e9d0-7cc8-9b29-bb8d226a9331" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_ContingentConsiderationMember_01a179d8-0b54-7ce9-a0cd-3c5e5d852bf3" xlink:href="svco-20260930.xsd#svco_ContingentConsiderationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a179d6-e9d0-7cc8-9b29-bb8d226a9331" xlink:to="loc_svco_ContingentConsiderationMember_01a179d8-0b54-7ce9-a0cd-3c5e5d852bf3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019fd8eb-2884-743b-bc27-ca0996934edf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a179d6-e9d0-74a1-8870-5a17034184de" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019fd8eb-2884-743b-bc27-ca0996934edf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019fd8eb-2884-74ae-b071-58d3dce98fd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019fd8eb-2884-743b-bc27-ca0996934edf" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019fd8eb-2884-74ae-b071-58d3dce98fd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019fd8eb-2884-7fc0-9a6b-a28ec8f7cf21" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019fd8eb-2884-743b-bc27-ca0996934edf" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019fd8eb-2884-7fc0-9a6b-a28ec8f7cf21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019fd8eb-2884-77e3-b7f9-a1147a2d720d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019fd8eb-2884-743b-bc27-ca0996934edf" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019fd8eb-2884-77e3-b7f9-a1147a2d720d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019fd8eb-2884-704a-9487-b5d1e9e61509" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019fd8eb-2884-743b-bc27-ca0996934edf" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019fd8eb-2884-704a-9487-b5d1e9e61509" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019fd8eb-2884-7215-a33e-cf6a1f655942" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/FairValueofFinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#FairValueofFinancialInstrumentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/FairValueofFinancialInstrumentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a15d45-eec2-7d31-ab11-720f1d95723f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a15d45-eec2-7f97-ad14-4108454d0e50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a15d45-eec2-7d31-ab11-720f1d95723f" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a15d45-eec2-7f97-ad14-4108454d0e50" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a15d45-eec2-7cb8-8e5e-bc96dec90bd9" 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_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a15d45-eec2-7f97-ad14-4108454d0e50" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a15d45-eec2-7cb8-8e5e-bc96dec90bd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a15d45-eec2-7cb8-8e5e-bc96dec90bd9_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_01a15d45-eec2-7cb8-8e5e-bc96dec90bd9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a15d45-eec2-7cb8-8e5e-bc96dec90bd9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a15d45-eec2-72f7-b59d-0fd347dc8b61" 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_01a15d45-eec2-7cb8-8e5e-bc96dec90bd9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a15d45-eec2-72f7-b59d-0fd347dc8b61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_01a15d45-eec2-7bb6-bef7-b894dd61d997" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a15d45-eec2-72f7-b59d-0fd347dc8b61" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_01a15d45-eec2-7bb6-bef7-b894dd61d997" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_01a15d45-eec2-7d6c-828c-b4744494b070" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a15d45-eec2-7f97-ad14-4108454d0e50" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_01a15d45-eec2-7d6c-828c-b4744494b070" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_01a15d45-eec2-7d6c-828c-b4744494b070_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_01a15d45-eec2-7d6c-828c-b4744494b070" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_01a15d45-eec2-7d6c-828c-b4744494b070_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_01a15d45-eec2-7e85-8471-22c2e2c6d6b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_01a15d45-eec2-7d6c-828c-b4744494b070" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_01a15d45-eec2-7e85-8471-22c2e2c6d6b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputPriceVolatilityMember_01a15d45-eec2-7e5d-933c-5a59fc7791a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputPriceVolatilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_01a15d45-eec2-7e85-8471-22c2e2c6d6b3" xlink:to="loc_us-gaap_MeasurementInputPriceVolatilityMember_01a15d45-eec2-7e5d-933c-5a59fc7791a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_MeasurementInputConversionProbabiltyMember_01a18325-aaf6-75a4-b463-186215d440ce" xlink:href="svco-20260930.xsd#svco_MeasurementInputConversionProbabiltyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_01a15d45-eec2-7e85-8471-22c2e2c6d6b3" xlink:to="loc_svco_MeasurementInputConversionProbabiltyMember_01a18325-aaf6-75a4-b463-186215d440ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_MeasurementInputConversionRateAdjustmentProbabilityMember_01a18326-15ff-7c31-99f8-e515f8fd7d5c" xlink:href="svco-20260930.xsd#svco_MeasurementInputConversionRateAdjustmentProbabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_01a15d45-eec2-7e85-8471-22c2e2c6d6b3" xlink:to="loc_svco_MeasurementInputConversionRateAdjustmentProbabilityMember_01a18326-15ff-7c31-99f8-e515f8fd7d5c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_MeasurementInputChangeOfControlProbabilityRateMember_01a15d45-eec2-7ae5-b1b3-7d5b61a8e935" xlink:href="svco-20260930.xsd#svco_MeasurementInputChangeOfControlProbabilityRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_01a15d45-eec2-7e85-8471-22c2e2c6d6b3" xlink:to="loc_svco_MeasurementInputChangeOfControlProbabilityRateMember_01a15d45-eec2-7ae5-b1b3-7d5b61a8e935" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_01a187a2-2650-754a-b7c5-93daee42ab2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputRiskFreeInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_01a15d45-eec2-7e85-8471-22c2e2c6d6b3" xlink:to="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_01a187a2-2650-754a-b7c5-93daee42ab2a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_01a15d45-eec2-7f58-a508-ab826491bb14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_01a15d45-eec2-7e85-8471-22c2e2c6d6b3" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_01a15d45-eec2-7f58-a508-ab826491bb14" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityMeasurementInput_01a15d45-eec2-759f-bf96-f90c5414ede6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a15d45-eec2-7d31-ab11-720f1d95723f" xlink:to="loc_us-gaap_DerivativeLiabilityMeasurementInput_01a15d45-eec2-759f-bf96-f90c5414ede6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/FairValueofFinancialInstrumentsScheduleofRollForwardoftheDerivativeLiabilityDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#FairValueofFinancialInstrumentsScheduleofRollForwardoftheDerivativeLiabilityDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/FairValueofFinancialInstrumentsScheduleofRollForwardoftheDerivativeLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a179d8-b8f3-7ba4-8d5a-83bbde5a5840" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a179d8-b8f3-7299-8f98-4feed4919636" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a179d8-b8f3-7ba4-8d5a-83bbde5a5840" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a179d8-b8f3-7299-8f98-4feed4919636" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_01a179d8-b8f3-72fb-8192-fd378c6f910d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a179d8-b8f3-7299-8f98-4feed4919636" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_01a179d8-b8f3-72fb-8192-fd378c6f910d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a179d8-b8f3-72fb-8192-fd378c6f910d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_01a179d8-b8f3-72fb-8192-fd378c6f910d" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a179d8-b8f3-72fb-8192-fd378c6f910d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a179d8-b8f3-73cf-8b82-c0a48301180d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_01a179d8-b8f3-72fb-8192-fd378c6f910d" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a179d8-b8f3-73cf-8b82-c0a48301180d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_01a179d9-4dcb-78e2-92ec-2fc8248747b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a179d8-b8f3-73cf-8b82-c0a48301180d" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_01a179d9-4dcb-78e2-92ec-2fc8248747b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a187a3-6dec-79da-b056-d71eaef815b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a179d8-b8f3-7ba4-8d5a-83bbde5a5840" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a187a3-6dec-79da-b056-d71eaef815b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_01a177e9-01a9-73db-bb3e-fe71c7d80e8d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a187a3-6dec-79da-b056-d71eaef815b5" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_01a177e9-01a9-73db-bb3e-fe71c7d80e8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_01a15d33-936c-759c-a195-bfc78358416c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a187a3-6dec-79da-b056-d71eaef815b5" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_01a15d33-936c-759c-a195-bfc78358416c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_01a177ea-19d7-7d58-a658-8d4c00690f5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://silvaco.com/role/SaleofCommonStockDetails" xlink:type="simple" xlink:href="svco-20260930.xsd#SaleofCommonStockDetails"/>
  <link:definitionLink xlink:role="http://silvaco.com/role/SaleofCommonStockDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019fd8eb-2884-7512-82a6-970f6b08992e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityClassOfTreasuryStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfTreasuryStockTable_019fd8eb-2884-71af-a9a2-f701992795cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfTreasuryStockTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019fd8eb-2884-7512-82a6-970f6b08992e" xlink:to="loc_us-gaap_ClassOfTreasuryStockTable_019fd8eb-2884-71af-a9a2-f701992795cd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019fd8eb-2884-7cb0-8944-5cf79110831e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_019fd8eb-2884-71af-a9a2-f701992795cd" xlink:to="loc_srt_CounterpartyNameAxis_019fd8eb-2884-7cb0-8944-5cf79110831e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fd8eb-2884-7cb0-8944-5cf79110831e_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019fd8eb-2884-7cb0-8944-5cf79110831e" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fd8eb-2884-7cb0-8944-5cf79110831e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fd8eb-2884-745f-ac0e-e743af5ff5c2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019fd8eb-2884-7cb0-8944-5cf79110831e" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fd8eb-2884-745f-ac0e-e743af5ff5c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_JefferiesLLCMember_019fd8eb-2884-7d2b-bc8c-8effbf28795d" xlink:href="svco-20260930.xsd#svco_JefferiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fd8eb-2884-745f-ac0e-e743af5ff5c2" xlink:to="loc_svco_JefferiesLLCMember_019fd8eb-2884-7d2b-bc8c-8effbf28795d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019fd8eb-2884-76f2-a2fc-f699c51a7291" 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_ClassOfTreasuryStockTable_019fd8eb-2884-71af-a9a2-f701992795cd" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019fd8eb-2884-76f2-a2fc-f699c51a7291" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019fd8eb-2884-76f2-a2fc-f699c51a7291_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_019fd8eb-2884-76f2-a2fc-f699c51a7291" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019fd8eb-2884-76f2-a2fc-f699c51a7291_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019fd8eb-2884-77b6-ac48-acbfac00b605" 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_019fd8eb-2884-76f2-a2fc-f699c51a7291" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019fd8eb-2884-77b6-ac48-acbfac00b605" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivatePlacementMember_019fd8eb-2884-7dc6-aed0-7e8f159c219f" 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_019fd8eb-2884-77b6-ac48-acbfac00b605" xlink:to="loc_us-gaap_PrivatePlacementMember_019fd8eb-2884-7dc6-aed0-7e8f159c219f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_SaleOfStockMaximumOfferingPrice_019fd8eb-2884-7228-b7e1-38ed5491f14f" xlink:href="svco-20260930.xsd#svco_SaleOfStockMaximumOfferingPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019fd8eb-2884-7512-82a6-970f6b08992e" xlink:to="loc_svco_SaleOfStockMaximumOfferingPrice_019fd8eb-2884-7228-b7e1-38ed5491f14f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019fd8eb-2884-7587-8640-57f1a51dab31" 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_EquityClassOfTreasuryStockLineItems_019fd8eb-2884-7512-82a6-970f6b08992e" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019fd8eb-2884-7587-8640-57f1a51dab31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_019fd8eb-2884-7f48-b543-fc9c1448c0f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019fd8eb-2884-7512-82a6-970f6b08992e" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_019fd8eb-2884-7f48-b543-fc9c1448c0f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_svco_SaleOfStockConsiderationReceivedOnTransactionIncludingStockIssuanceCosts_019fd8eb-2884-7e7d-8a10-dee15282d290" xlink:href="svco-20260930.xsd#svco_SaleOfStockConsiderationReceivedOnTransactionIncludingStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019fd8eb-2884-7512-82a6-970f6b08992e" xlink:to="loc_svco_SaleOfStockConsiderationReceivedOnTransactionIncludingStockIssuanceCosts_019fd8eb-2884-7e7d-8a10-dee15282d290" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_01a18979-6c99-773b-a184-c2c8088153ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019fd8eb-2884-7512-82a6-970f6b08992e" xlink:to="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_01a18979-6c99-773b-a184-c2c8088153ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_019fd8eb-2884-794b-81ff-c10c055da009" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019fd8eb-2884-7512-82a6-970f6b08992e" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_019fd8eb-2884-794b-81ff-c10c055da009" xlink:type="arc" order="5"/>
  </link:definitionLink>
</link:linkbase>
