Sphère

n. round three-dimensional geometric figure whose surface is at all points equidistant from the center; ball, globe, orb; heavens, sky; celestial body, planet; domain, realm, area

A sphere is a symmetrical geometrical object. In non-mathematical usage, the term is used to refer either to a round ball or to its two-dimensional surface. In mathematics, a sphere is the set of all points in three-dimensional space (R3) which are at distance r from a fixed point of that space, where r is a positive real number called the radius of the sphere. Thus, in three dimensions, a mathematical sphere is considered to be a spherical surface, rather than the volume contained within it. The fixed point is called the center or centre, and is not part of the sphere itself. The special case of r = 1 is called a unit sphere.
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Noun
1. a particular environment or walk of life; "his social sphere is limited"; "it was a closed area of employment"; "he's out of my orbit"
(synonym) domain, area, orbit, field, arena
(hypernym) environment
(hyponym) distaff
2. any spherically shaped artifact
(hypernym) artifact, artefact
(hyponym) globe
3. the geographical area in which one nation is very influential
(synonym) sphere of influence
(hypernym) geographical area, geographic area, geographical region, geographic region
4. a particular aspect of life or activity; "he was helpless in an important sector of his life"
(synonym) sector
(hypernym) aspect, facet
(hyponym) department
5. a solid figure bounded by a spherical surface (including the space it encloses)
(hypernym) round shape
(hyponym) conglomeration, conglobation
6. a three-dimensional closed surface such that every point on the surface is equidistant from the center
(hypernym) round shape
(part-meronym) steradian, sr
7. the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
(synonym) celestial sphere, empyrean, firmament, heavens, vault of heaven, welkin
(hypernym) surface
(part-meronym) apex, solar apex, apex of the sun's way

n. sphere, globe, area; field, range

(v. t.)
To place in a sphere, or among the spheres; to insphere.
  

(v. t.)
To form into roundness; to make spherical, or spheral; to perfect.
  

(n.)
The extension of a general conception, or the totality of the individuals or species to which it may be applied.
  

(n.)
The apparent surface of the heavens, which is assumed to be spherical and everywhere equally distant, in which the heavenly bodies appear to have their places, and on which the various astronomical circles, as of right ascension and declination, the equator, ecliptic, etc., are conceived to be drawn; an ideal geometrical sphere, with the astronomical and geographical circles in their proper positions on it.
  

(n.)
Rank; order of society; social positions.
  

(n.)
In ancient astronomy, one of the concentric and eccentric revolving spherical transparent shells in which the stars, sun, planets, and moon were supposed to be set, and by which they were carried, in such a manner as to produce their apparent motions.
  

(n.)
Hence, any globe or globular body, especially a celestial one, as the sun, a planet, or the earth.
  

(n.)
Circuit or range of action, knowledge, or influence; compass; province; employment; place of existence.
  

(n.)
An orbit, as of a star; a socket.
  

(n.)
A body or space contained under a single surface, which in every part is equally distant from a point within called its center.