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Definition of invalidate:

  1. 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.


misdirect, deflower, deflate, keep down, ward off, explode, void, vitiate, avert, spoil, discredit, corrupt, scratch, demoralize, obviate, null, disannul, empty, keep off, subjugate, demoralise, rescind, profane, roll back, debunk, nullify, annihilate, pervert, debase, deflect, abate, avoid, countermand, deprave, fend off, subvert, award, confound, acquit, subdue, debauch, vacate, quash, offset, forfend, continue, disabuse, mar, deflate, call for, stave off, set aside, bar, lift, debar, bring in a verdict, evacuate, reduce, forefend, cancel, annul, scrub, set off, neutralise, repress, strike down, call off, charge, citation, acquittal, head off.

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