Definition of sphere noun from the Oxford Advanced Learner's Dictionary

      

    sphere

     noun
    noun
    BrE BrE//sfɪə(r)//
     
    ; NAmE NAmE//sfɪr//
     
     
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  1. 1 (geometry) a solid figure that is completely round, with every point on its surface at an equal distance from the centre
  2. 2any object that is completely round, for example a ball
  3. 3an area of activity, influence or interest; a particular section of society synonym domain the political sphere This area was formerly within the sphere of influence of the US. He and I moved in totally different social spheres.
  4. 4-sphere (in nouns) a region that surrounds a planet, especially the earth ionosphere atmosphere
  5. Word Origin Middle English: from Old French espere, from late Latin sphera, earlier sphaera, from Greek sphaira ‘ball’.Extra examples His work is little known outside the academic sphere. In the novel, men and women enjoy separate spheres of action. The matter is outside my sphere of responsibility. The region is within the Russian sphere of influence. Debate should be confined to the sphere of economics rather than politics. The government had control over all spheres of life.
See the Oxford Advanced American Dictionary entry: sphere