hallucination Meaning, Definition & Usage

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

WordNet

Hal*lu`ci*na"tion noun
Etymology
L. hallucinatio cf. F. hallucination.
Definitions
  1. The act of hallucinating; a wandering of the mind; error; mistake; a blunder.
    This must have been the hallucination of the transcriber. Addison.
  2. (Med.) The perception of objects which have no reality, or of sensations which have no corresponding external cause, arising from disorder or the nervous system, as in delirium tremens; delusion.
    Hallucinations are always evidence of cerebral derangement and are common phenomena of insanity. W. A. Hammond.

Webster 1913