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The Collaborative International Dictionary of English v.0.48 (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]