Definition of vitiate verb from the Oxford Advanced American Dictionary

 

vitiate

 verb
verb
NAmE//ˈvɪʃiˌeɪt//
 
[usually passive]vitiate something(formal)Verb Forms present simple I / you / we / they vitiate
 
he / she / it vitiates
 
past simple vitiated
 
-ing form vitiating
 
 
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to spoil or reduce the effect of something The “yes” vote was vitiated by the low turnout in the election.
See the Oxford Advanced Learner's Dictionary entry: vitiate