Hallucination definition

hə-lo͝osə-nāshən
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The apparent perception of sights, sounds, etc. that are not actually present: it may occur in certain mental disorders.
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The imaginary object apparently seen, heard, etc.
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The definition of a hallucination is something that someone sees or imagines that is not really there.

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

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A false or mistaken idea.
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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.
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The objects or events so perceived.
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A false or mistaken idea.
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Perception of visual, auditory, tactile, olfactory, or gustatory stimuli in the absence of any external objects or events and with a compelling sense of their reality, resulting from certain mental and physical disorders or as a response to a drug.
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The objects or events so perceived.
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A sensory perception of something that does not exist, often arising from disorder of the nervous system, as in delirium tremens; a delusion.

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The act of hallucinating; a wandering of the mind; an error, mistake or blunder.

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Other Word Forms

Noun

Singular:
hallucination
Plural:
hallucinations

Origin of hallucination

  • Derives from verb to hallucinate, from Latin hallucinatus. Compare French hallucination. The first known usage in the English language is from Sir Thomas Browne.

    From Wiktionary