- 1(geometry) a solid figure that is completely round, with every point on its surface at an equal distance from the center
- 2any object that is completely round, for example a ball
- 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 U.S. He and I moved in totally different social spheres.
- 4-sphere (in nouns) a region that surrounds a planet, especially the earth ionosphere atmosphere
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