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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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British Dictionary definitions for invalidation

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 invalidation
n.

1771, noun of action from invalidate (v.).

invalidate

v.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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