Meaning of invalidate

in•val•i•date

Pronunciation: (in-val'i-dāt"), [key]

— -dat•ed, -dat•ing.

to render invalid; discredit.
to deprive of legal force or efficacy; nullify.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

See also:

invalidate (Thesaurus)

invalid invalidism

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