hallucination

The definition of a hallucination is something that someone sees or imagines that is not really there.

(noun)

An example of a hallucination is a vision of a pool in a hot desert.

See hallucination in Webster's New World College Dictionary

noun

the apparent perception of sights, sounds, etc. that are not actually present: it may occur in certain mental disorders
the imaginary object apparently seen, heard, etc.

Origin: L hallucinatio < hallucinari: see hallucinate

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See hallucination in American Heritage Dictionary 4

noun

a. 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.
b. The objects or events so perceived.
A false or mistaken idea; a delusion.

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