invalidate

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in·val·i·date / inˈvaliˌdāt/ • v. [tr.] 1. make (an argument, statement, or theory) unsound or erroneous.2. deprive (an official document or procedure) of legal efficacy because of contravention of a regulation or law: a technical flaw in her papers invalidated her nomination.DERIVATIVES: in·val·i·da·tion / -ˌvaliˈdāshən/ n.in·val·i·da·tor / -ˌdātər/ n.