Definition of hallucination
1 a : perception of objects with no reality usually arising from disorder of the nervous system or in response to drugs (as LSD) b : the object so perceived
2 : an unfounded or mistaken impression or notion : delusion
Examples of hallucination in a sentence
He could not tell if what he was seeing was real or if it was a hallucination.
He has been having hallucinations due to the medication.
First Known Use of hallucination
Synonym Discussion of hallucination
HALLUCINATION Defined for English Language Learners
Definition of hallucination for English Language Learners
: something (such as an image, a sound, or a smell) that seems real but does not really exist and that is usually caused by mental illness or the effect of a drug
HALLUCINATION Defined for Kids
Definition of hallucination for Students
: the seeing of objects or the experiencing of feelings that are not real but are usually the result of mental disorder or the effect of a drug
Medical Definition of hallucination
1: a perception of something (as a visual image or a sound) with no external cause usually arising from a disorder of the nervous system (as in delirium tremens or in functional psychosis without known neurological disease) or in response to drugs (as LSD)—compare delusion 2, illusion 2a
2: the object of a hallucinatory perception
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