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1. Illusory perception; a common symptom of severe mental disorder
    
2. A mistaken or unfounded opinion or idea
   "his dreams of vast wealth are a hallucination";
   - delusion
    
3. An object perceived during a hallucinatory episode
   "he refused to believe that the angel was a hallucination"

Derived forms: hallucinations

Type of: delusion, misconception, object, psychotic belief

Encyclopedia: Hallucination