Definition of 'hallucination'

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Noun

1. illusory perception; a common symptom of severe mental disorder
2. a mistaken or unfounded opinion or idea; "he has delusions of competence"; "his dreams of vast wealth are a hallucination"
      Synonyms: delusion
3. an object perceived during a hallucinatory episode; "he refused to believe that the angel was a hallucination"

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