sphere

Universal Words noun 1 (geometry) a solid figure that is completely round, with every point on its surface at an equal distance from the centre 2 any object that is completely round, for example a ball 3 an area of activity, influence or interest; a particular section of society: the political / economic sphere * This area was formerly within the sphere of influence of the US. * He and I moved in totally different social spheres. 4 (-sphere) (in nouns) a region that surrounds a planet, especially the earth: ionosphere * atmosphere