Definition of vitiate verb from the Oxford Advanced Learner's Dictionary

 

vitiate

 verb
verb
BrE BrE//ˈvɪʃieɪt//
 
; NAmE NAmE//ˈvɪʃieɪt//
 
Verb Forms present simple I / you / we / they vitiate
BrE BrE//ˈvɪʃieɪt//
 
; NAmE NAmE//ˈvɪʃieɪt//
 
he / she / it vitiates
BrE BrE//ˈvɪʃieɪts//
 
; NAmE NAmE//ˈvɪʃieɪts//
 
past simple vitiated
BrE BrE//ˈvɪʃieɪtɪd//
 
; NAmE NAmE//ˈvɪʃieɪtɪd//
 
past participle vitiated
BrE BrE//ˈvɪʃieɪtɪd//
 
; NAmE NAmE//ˈvɪʃieɪtɪd//
 
-ing form vitiating
BrE BrE//ˈvɪʃieɪtɪŋ//
 
; NAmE NAmE//ˈvɪʃieɪtɪŋ//
 
 
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[usually passive] vitiate something (formal) to spoil or reduce the effect of something The ‘yes’ vote was vitiated by the low turnout in the election. Word Origin mid 16th cent.: from Latin vitiat- ‘impaired’, from the verb vitiare, from vitium.
See the Oxford Advanced American Dictionary entry: vitiate