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invalidate

[in-val-i-deyt] /ɪnˈvæl ɪˌdeɪt/
verb (used with object), invalidated, invalidating.
1.
to render invalid; discredit.
2.
to deprive of legal force or efficacy; nullify.
Origin
1640-1650
1640-50; invalid2 + -ate1
Related forms
invalidation, noun
invalidator, noun
Synonyms
1. weaken, impair; disprove, refute, rebut.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

invalidate

/ɪnˈvælɪˌdeɪt/
verb (transitive)
1.
to render weak or ineffective, as an argument
2.
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
v.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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