hallucination
/həˌluːsɪˈneɪʃən/ · hal·lu·ci·na·tion
noun
- A sensory perception of something that does not exist, often arising from disorder of the nervous system, as in delirium tremens; a delusion. The patient's hallucination of a snake in the room was a clear sign of her deteriorating mental state.
- The act of hallucinating; a wandering of the mind; an error, mistake or blunder. The team's hallucination about the game's outcome led to their poor performance on the field.
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Did you know? The term 'hallucination' was first used in the 15th century to describe a wandering of the mind, and was later adopted in the medical field to describe a specific type of sensory disorder.