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Verb: vitiate  'vishee`eyt
  1. Corrupt morally or by intemperance or sensuality
    - corrupt, pervert, subvert, demoralize, demoralise [Brit], debauch, debase, profane, deprave, misdirect
     
  2. Make imperfect
    - mar, impair, spoil, deflower
     
  3. Take away the legal force of or render ineffective
    - invalidate, void

Derived forms: vitiates, vitiated, vitiating

See also: vitiation

Type of: alter, change, damage, modify