vitiate

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Vitiate

To impair or make void; to destroy or annul, either completely or partially, the force and effect of an act or instrument.

Mutual mistake or Fraud, for example, might vitiate a contract.

West's Encyclopedia of American Law, edition 2. Copyright 2008 The Gale Group, Inc. All rights reserved.

vitiate

to destroy the force or legal effect of, for example, a deed.
Collins Dictionary of Law © W.J. Stewart, 2006