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English definition of “psychosis”

psychosis

noun [C or U] uk   /saɪˈkəʊ.sɪs/ us    /-ˈkoʊ-/ (plural psychoses)
any of a number of the more severe mental diseases that make you believe things that are not real: She fell into a drug-induced psychosis.
(Definition of psychosis from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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