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vitiate

[vish-ee-eyt]
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verb (used with object), vi·ti·at·ed, vi·ti·at·ing.
  1. to impair the quality of; make faulty; spoil.
  2. to impair or weaken the effectiveness of.
  3. to debase; corrupt; pervert.
  4. to make legally defective or invalid; invalidate: to vitiate a claim.
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Origin of vitiate

1525–35; < Latin vitiātus, past participle of vitiāre to spoil, derivative of vitium blemish, vice1 + -ātus -ate1
Related formsvi·ti·a·tion, nounvi·ti·a·tor, nounnon·vi·ti·a·tion, nounun·vi·ti·at·ed, adjectiveun·vi·ti·at·ing, adjective
Can be confusedameliorate obviate vitiate
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for vitiate

vitiate

verb (tr)
  1. to make faulty or imperfect
  2. to debase, pervert, or corrupt
  3. to destroy the force or legal effect of (a deed, etc)to vitiate a contract
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Derived Formsvitiable, adjectivevitiation, nounvitiator, noun

Word Origin

C16: from Latin vitiāre to injure, from vitium a fault
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for vitiate

v.

1530s, from Latin vitiatus, past participle of vitiare "to make faulty, injure, spoil, corrupt," from vitium "fault, defect, blemish, crime, vice" (see vice (n.1)). Related: Vitiated; vitiating.

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Online Etymology Dictionary, © 2010 Douglas Harper