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English definition of “staircase”

staircase

noun [C]     /ˈsteə.keɪs/ US  /ˈster-/
C1 a set of stairs inside a building, usually with a bar fixed on the wall or onto vertical poles at the side for you to hold on to: She descended the sweeping (= long and wide) staircase into the crowd of photographers and journalists.Stairs and lifts
(Definition of staircase noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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