Meaning & use
hallucination
A perception of something, such as a sight or sound, that seems real but is not actually present.
See it in a sentence
The fever caused him to have a hallucination of insects crawling on the wall.
Certain medications can trigger hallucinations as a rare but serious side effect.
A note on using this word
A hallucination involves perceiving something that does not exist, while a delusion is a false belief held despite evidence.
Words with a similar meaning
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