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English definition of “the first floor”

the first floor

noun [S]    
B1 UK the level of a building that is one level above the street: She works on the first floor.Floors and parts of floors B1 US the level of a building that is at the same level as the street → Compare ground floorFloors and parts of floors first-floor     /ˌfɜːstˈflɔːr/ US  /ˌfɝːstˈflɔːr/ adjective [before noun] B1 a first-floor flat/apartment/officeFloors and parts of floors
(Definition of the first floor noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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