Etymology
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hallucination (n.)

"a seeing or hearing something which is not there," 1640s, from Latin hallucinationem (nominative hallucinatio), earlier alucinatio, noun of action from past-participle stem of alucinari (see hallucinate). Related: Hallucinations.

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Definitions of hallucination

hallucination (n.)
illusory perception; a common symptom of severe mental disorder;
hallucination (n.)
a mistaken or unfounded opinion or idea;
his dreams of vast wealth are a hallucination
Synonyms: delusion
hallucination (n.)
an object perceived during a hallucinatory episode;
he refused to believe that the angel was a hallucination
From wordnet.princeton.edu