sphere
Pronunciation: /sfɪə/
noun
- 1a round solid figure, or its surface, with every point on its surface equidistant from its centre.
- a spherical object; a ball or globe: the markers on the route included two conspicuous black spheres
- a globe representing the earth: the room was littered with books, maps, and spheres
- chiefly literary a celestial body: he sometimes took out his telescope to make sure the spheres were still revolving in good order
- literary the sky perceived as a vault upon or in which celestial bodies are represented as lying.
- each of a series of revolving concentrically arranged spherical shells in which celestial bodies were formerly thought to be set in a fixed relationship.
verb

Phrases
-
music (or harmony) of the spheres
- the natural harmonic tones supposedly produced by the movement of the celestial spheres or the bodies fixed in them.
-
sphere of influence (or interest)
- a country or area in which another country has power to affect developments though it has no formal authority: there was increasing friction between Russia and Germany concerning their respective spheres of influence in eastern Europe
- a field or area in which an individual or organization has power to affect events and developments: we need a system in which agencies have clearer boundaries to their sphere of influence

Origin:
Middle English: from Old French espere, from late Latin sphera, earlier sphaera, from Greek sphaira 'ball'