'Hallucination' definitions:

Definition of 'hallucination'

From: WordNet
noun
Illusory perception; a common symptom of severe mental disorder
noun
A mistaken or unfounded opinion or idea; "he has delusions of competence"; "his dreams of vast wealth are a hallucination" [syn: delusion, hallucination]
noun
An object perceived during a hallucinatory episode; "he refused to believe that the angel was a hallucination"

Definition of 'Hallucination'

From: GCIDE
  • Hallucination \Hal*lu`ci*na"tion\ (-n[=a]"sh[u^]n), n. [L. hallucinatio: cf. F. hallucination.]
  • 1. The act of hallucinating; a wandering of the mind; error; mistake; a blunder. [1913 Webster]
  • This must have been the hallucination of the transcriber. --Addison. [1913 Webster]
  • 2. (Med.) The perception of objects which have no reality, or of sensations which have no corresponding external cause, arising from disorder of the nervous system, as in delirium tremens; delusion. [1913 Webster]
  • Hallucinations are always evidence of cerebral derangement and are common phenomena of insanity. --W. A. Hammond. [1913 Webster]

Synonyms of 'hallucination'

From: Moby Thesaurus