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English definition of “semicircle”

semicircle

noun [C usually singular]     /ˈsem.iˌsɜː.kl̩/ US  /-ˌsɝː-/
half a circle : We arranged the chairs in a semicircle.Geometrical shapesSpherical, circular and annular objects
(Definition of semicircle noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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