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Definition of: hallucination
(hə·l′sə·nā′shən) noun
1. An apparent perception without any corresponding external object.
2. Psychiatry Any of numerous sensations, auditory, visual, or tactile, experienced without external stimulus, and caused by mental derangement, intoxication, or fever. See ILLUSION.
3. A mistaken notion. See synonyms under DELUSION, DREAM, ERROR.
—hal·lu·ci·na·to·ry (hə·l′sə·nə·tôr′ē, -tō′rē) adjective
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