Meaning of “REM” in the English Dictionary

british dictionary

"REM" in British English

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REMnoun [ U ]

uk /rem/ /ˌɑːr.iːˈem/ /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 Learner’s Dictionary & Thesaurus © Cambridge University Press)