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English definition of “ER”

ER

noun [C usually singular] uk   /ˌiːˈɑːr/ us    /-ˈɑːr/

ER noun [C usually singular] (HOSPITAL)

US abbreviation for emergency roomMedical places and organizations

ER noun [C usually singular] (THE QUEEN)

abbreviation for Elizabeth Regina: Queen Elizabeth IIRoyalty, aristocracy and titles
(Definition of ER noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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