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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 In·val·i·date v. t. [imp. & p. p. Invalidated p. pr. & vb. n. Invalidating.]  To render invalid; to weaken or lessen the force of; to destroy the authority of; to render of no force or effect; to overthrow; as, to invalidate an agreement or argument.
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From: WordNet (r) 2.0

 invalidating
      adj : establishing as invalid or untrue [syn: disconfirming]