Webster's English Dictionary

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vitiate

Cross references:
  1. debase                
 
vi.ti.ate \'vish-e--.a-t\ \'vish-e--.a-t-*r\ vt [L vitiatus, pp. of 
   vitiare, fr. vitium fault] 1: CONTAMINATE, POLLUTE  2: DEBASE, PERVERT  3: 
   to make ineffective or weak : INVALIDATE  - vi.ti.a.tor n