HALLUCINATION
hallucination
(noun) an object perceived during a hallucinatory episode; āhe refused to believe that the angel was a hallucinationā
delusion, hallucination
(noun) a mistaken or unfounded opinion or idea; āhe has delusions of competenceā; āhis dreams of vast wealth are a hallucinationā
hallucination
(noun) illusory perception; a common symptom of severe mental disorder
Source: WordNet® 3.1
Etymology
Noun
hallucination (countable and uncountable, plural hallucinations)
A sensory perception of something that does not exist, often arising from disorder of the nervous system, as in delirium tremens; a delusion.
The act of hallucinating; a wandering of the mind; an error, mistake or blunder.
Source: Wiktionary
Hal*lu`ci*na"tion, n. Etym: [L. hallucinatio cf. F. hallucination.]
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.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition