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English definition of “sphere”

sphere

noun [C]     /sfɪər/
SUBJECT a subject or area of knowledge, work, etc: the political sphereTopics and areas of interest
SHAPE a round object shaped like a ballSpherical, circular and annular objectsGeometrical shapesGeometrical shapesSpherical, circular and annular objects
(Definition of sphere noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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