ER noun Definition in Cambridge British English Dictionary
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Definition of "ER" - British English Dictionary

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ERnoun [C usually singular]

uk   /ˌiːˈɑːr/  us   /-ˈɑːr/

ER noun [C usually singular] (HOSPITAL)

US abbreviation for emergency room

ER noun [C usually singular] (THE QUEEN)

abbreviation for Elizabeth Regina: Queen Elizabeth II
(Definition of ER noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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