Definition of hallucination noun from the Oxford Advanced American Dictionary

     

    hallucination

     noun
    noun
    NAmE//həˌlusəˈneɪʃn//
     
     
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  1. 1[countable, uncountable] the fact of seeming to see or hear someone or something that is not really there, especially because of illness or drugs to have hallucinations High temperatures can cause hallucination.
  2. 2[countable] something that is seen or heard when it is not really there Was the figure real or just a hallucination?
See the Oxford Advanced Learner's Dictionary entry: hallucination