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invalidate: Meaning and Definition of

in•val•i•date

Pronunciation: (in-val'i-dāt"), [key]
— -dat•ed, -dat•ing.
  1. to render invalid; discredit.
  2. to deprive of legal force or efficacy; nullify.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
invalid invalidism
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