Definition of hallucination noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//həˌluːsɪˈneɪʃn//
    ; NAmE NAmE//həˌluːsɪˈneɪʃn//
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  1. 1[countable, uncountable] the fact of seeming to see or hear somebody/something that is not really there, especially because of illness or drugs to have hallucinations High temperatures can cause hallucination. She was admitted to hospital suffering from hallucinations.
  2. 2[countable] something that is seen or heard when it is not really there Was the figure real or just a hallucination?
  3. Some speakers do not pronounce the ‘h’ at the beginning of hallucination and use ‘an’ instead of ‘a’ before it. This now sounds old-fashioned.
    Word Originearly 17th cent.: from Latin hallucinatio(n-), from the verb hallucinari, from Greek alussein ‘be uneasy or distraught’.
See the Oxford Advanced American Dictionary entry: hallucination