Simple Definition of hallucination
: 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
Full 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 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
Learn More about hallucination
Seen and Heard
What made you want to look up hallucination? Please tell us where you read or heard it (including the quote, if possible).