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

 

hallucinate

 verb
verb
BrE BrE//həˈluːsɪneɪt//
 
; NAmE NAmE//həˈluːsɪneɪt//
 
[intransitive]Verb Forms present simple I / you / we / they hallucinate
BrE BrE//həˈluːsɪneɪt//
 
; NAmE NAmE//həˈluːsɪneɪt//
 
he / she / it hallucinates
BrE BrE//həˈluːsɪneɪts//
 
; NAmE NAmE//həˈluːsɪneɪts//
 
past simple hallucinated
BrE BrE//həˈluːsɪneɪtɪd//
 
; NAmE NAmE//həˈluːsɪneɪtɪd//
 
past participle hallucinated
BrE BrE//həˈluːsɪneɪtɪd//
 
; NAmE NAmE//həˈluːsɪneɪtɪd//
 
-ing form hallucinating
BrE BrE//həˈluːsɪneɪtɪŋ//
 
; NAmE NAmE//həˈluːsɪneɪtɪŋ//
 
 
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to see or hear things that are not really there because of illness or drugs Wordfinderabuse, addict, deal, dependence, detoxification, drug, hallucinate, overdose, rehab, withdrawal Word Origin mid 17th cent. (in the sense ‘be deceived, have illusions’): from Latin hallucinat- ‘gone astray in thought’, from the verb hallucinari, from Greek alussein ‘be uneasy or distraught’.
See the Oxford Advanced American Dictionary entry: hallucinate