from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Perception of visual, auditory, tactile, olfactory, or gustatory experiences without an external stimulus and with a compelling sense of their reality, usually resulting from a mental disorder or as a response to a drug.
- n. The objects or events so perceived.
- n. A false or mistaken idea; a delusion.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A sensory perception of something that does not exist, arising from disorder of the nervous system, as in delirium tremens; a delusion.
- n. The act of hallucinating; a wandering of the mind; an error, mistake or blunder.
from the GNU version of the Collaborative International Dictionary of English
- n. The act of hallucinating; a wandering of the mind; error; mistake; a blunder.
- n. 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.
from The Century Dictionary and Cyclopedia
- n. An unfounded notion; belief in an unreality; a baseless or distorted conception.
- n. In pathology and psychology, the apparent perception of some external thing to which no real object corresponds.
- n. Synonyms Delusion, Illusion (see delusion); phantasm.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an object perceived during a hallucinatory episode
- n. illusory perception; a common symptom of severe mental disorder
- n. a mistaken or unfounded opinion or idea
Derives from verb to hallucinate, from Latin hallucinatus. Compare French hallucination. The first known usage in the English language is from Sir Thomas Browne. (Wiktionary)