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psychosis

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psychosis/saɪˈkoʊsəs/noun
pluralpsychoses/-ˈkoʊˌsiːz//saɪˈkoʊˌsiːz/
psychosis
/saɪˈkoʊsəs/
noun
pluralpsychoses/-ˈkoʊˌsiːz//saɪˈkoʊˌsiːz/
Learner's definition of PSYCHOSIS  
[count, noncount]
: a very serious mental illness that makes you behave strangely or believe things that are not true
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