Share this entry

invalidate Line breaks: in|vali|date
Pronunciation: /ɪnˈvalɪdeɪt/

Definition of invalidate in English:


[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.


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



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.

Definition of invalidate in:

Share this entry


What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day haughty
Pronunciation: ˈhɔːti
arrogantly superior and disdainful