Definition of invalidate in English:

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Pronunciation: /inˈvaləˌdāt/


[with object]
1Make (an argument, statement, or theory) unsound or erroneous.
Example sentences
  • His second is that finding unpleasant - even horrible - application of a scientific theory or philosophical argument invalidates the theory.
  • The reporter did ask, ‘Well, doesn't that invalidate just war theory as a whole?’
  • However, none of this invalidates the general theory that stock aligns CEO incentives with those of the shareholders better than does cash salary; it does.
weaken, undermine, explode
informal poke holes in
formal confute
2Deprive (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
More example sentences
  • In a four-hour opening address to a packed courtroom, the barrister went on to argue that invalidating the search warrants would set a precedent that would dangerously restrict their future operations.
  • These cases stress that errors, even fraudulent errors, do not automatically invalidate the warrant.
  • Finding such so-called prior art is the only way to invalidate a patent.



Pronunciation: /inˌvaləˈdāSH(ə)n/
Example sentences
  • I asked members of the faculty at the University of Chicago Law School to estimate the number of Supreme Court invalidations of state and federal law.
  • The newspaper has written to the Independent Committee Against Corruption asking for the immediate return of seized material and the invalidation of warrants used against it.
  • Under one of the bills, the Post-Privatisation Control Agency should be allowed to take action towards invalidation of privatisation contracts in circumstances, which would justify such action.


Pronunciation: /-ˌdātər/
Example sentences
  • The popularity of Theodore is due, not to his intellectual discernment (we laugh), but to his steady hatred of almost everything, and his capacity for being used as an invalidator, allowing a monopoly of prestige.
  • This encourages invalidators to look at their own feelings rather than blaming others for things that go wrong.
  • Basing his lecture around the short article by Imaam Ibn Baaz, the speaker outlines The ten main invalidators of Islaam.


Mid 17th century: from medieval Latin invalidat- 'annulled', from the verb invalidare (based on Latin validus 'strong').

For editors and proofreaders

Syllabification: in·val·i·date

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