HALLUCINATION

hallucination

(noun) an object perceived during a hallucinatory episode; “he refused to believe that the angel was a hallucination”

delusion, hallucination

(noun) a mistaken or unfounded opinion or idea; “he has delusions of competence”; “his dreams of vast wealth are a hallucination”

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