REM definition, meaning - what is REM in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “REM”

REM

noun [U] uk   /rem/ /ˌɑːr.iːˈem/
abbreviation for rapid eye movement: quick movements of the eyes that happen at certain times while you are sleeping and dreaming: REM sleep
(Definition of REM from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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