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invalidate

[ in-val-i-deyt ]
/ ɪnˈvæl ɪˌdeɪt /
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See synonyms for: invalidate / invalidated / invalidates / invalidation on Thesaurus.com

verb (used with object), in·val·i·dat·ed, in·val·i·dat·ing.
to render invalid; discredit.
to deprive of legal force or efficacy; nullify.
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Origin of invalidate

First recorded in 1640–50; invalid2 + -ate1

OTHER WORDS FROM invalidate

in·val·i·da·tion, nounin·val·i·da·tor, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use invalidate in a sentence

British Dictionary definitions for invalidate

invalidate
/ (ɪnˈvælɪˌdeɪt) /

verb (tr)
to render weak or ineffective, as an argument
to take away the legal force or effectiveness of; annul, as a contract

Derived forms of invalidate

invalidation, nouninvalidator, 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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