Definition of invalidate in English:

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Pronunciation: /ɪnˈvalɪdeɪt/


[with object]
1Make or prove (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.
2Deprive (an official document or procedure) of legal validity because it contravenes 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: /ɪnvalɪˈdeɪʃ(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.


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

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