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[in-val-i-deyt] /ɪnˈvæl ɪˌdeɪt/
verb (used with object), invalidated, invalidating.
to render invalid; discredit.
to deprive of legal force or efficacy; nullify.
Origin of invalidate
1640-50; invalid2 + -ate1
Related forms
invalidation, noun
invalidator, noun
1. weaken, impair; disprove, refute, rebut. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for invalidate
  • If a liar tells us that lying is wrong, this makes him a hypocrite, but it does not invalidate his claim.
  • But that confluence of interest doesn't necessarily invalidate the findings.
  • But these setbacks do not invalidate the notion of collective action.
  • It doesn't invalidate the estimates to make these allowances.
  • Any arrogance they may be prone to, though, doesn't invalidate the fearless physicists' insights.
  • The following, however, are some of the laws and practices that the amendment expected to invalidate.
  • The trial judge rejected his motion to suppress the evidence and invalidate his arrest.
  • But even critics say the persistence of a smell does not invalidate the technology.
  • The horse would invalidate the whole premise of the prologue, which invites the audience to use its imagination.
  • Their line of thinking would not only invalidate almost all patents, but all copyright as well.
British Dictionary definitions for invalidate


verb (transitive)
to render weak or ineffective, as an argument
to take away the legal force or effectiveness of; annul, as a contract
Derived Forms
invalidation, noun
invalidator, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for invalidate

1640s, from invalid + -ate (2). Related: Invalidated; invalidating.

Online Etymology Dictionary, © 2010 Douglas Harper
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