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English definition of “hallucination”

hallucination

noun [C or U]     /həˌluː.sɪˈneɪ.ʃən/
an experience in which you see , hear , feel , or smell something that does not exist , usually because you are ill or have taken a drug : A high temperature can cause hallucinations. auditory / olfactory hallucinationsDreaming
(Definition of hallucination noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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