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English definition of “staircase”

staircase

noun [C] uk   /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.
(Definition of staircase from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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