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first floor
1 the floor of a building just above the one at the bottom level [↪ ground floor]:
a flat on the first floor
the first floor
British EnglishTBBDHH
a flat on the first floor2 the floor of a building at the bottom level :
Fire broke out on the first floor of the apartment building.
the first floor
American EnglishTBBDHH
Fire broke out on the first floor of the apartment building.
