noun (n)

• illusory perception; a common symptom of severe mental disorder

  persepsi khayalan; common gejala parah gangguan mental

  source: wordnet30
• a mistaken or unfounded opinion or idea

  yang salah atau tak berdasar pendapat atau ide

  Example:
  His dreams of vast wealth are a hallucination.
  

  Synonym:
  delusion
  

  source: wordnet30
• an object perceived during a hallucinatory episode

  objek dirasakan selama hallucinatory episode

  Example:
  He refused to believe that the angel was a hallucination.
  

  source: wordnet30
• The act of hallucinating; a wandering of the mind; error; mistake; a blunder.

  NA

  source: webster1913