Part of speech: noun

An apparent perception without external cause; delusion.

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Usage examples "hallucination":

  1. In this hallucination he deceived himself even as Oliver Cromwell did later and equally for his own ends. - "England of My Heart--Spring", Edward Hutton.
  2. I had a kind of fit this morning, he explained, the result of an hallucination which seized me when my light went out in that cave. - "Benita, An African Romance", H. Rider Haggard.
  3. I have noticed this absurd hallucination in others, and been conscious of it in myself. - "Journal of an African Cruiser", Horatio Bridge.