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Dictionary

in•val•i•date

Pronunciation: (in-val'i-dāt"), [key]
—v.t., -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.

invalid

invalidism

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