Hallucination
/həˌlusəˈneɪʃən/
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Definition
(noun) A sensory perception of something that does not exist, often arising from disorder of the nervous system, as in delirium tremens.
Sentence Examples
All you saw was a hallucination.
Was it a hallucination or a daydream?
CEFR Practice Quiz
The patient experienced a vivid ____ caused by the high fever, as he thought he saw giant insects on the ceiling.