sphere
     n 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" [syn: {domain}, {area}, {orbit}, {field},
           {arena}]
     2: any spherically shaped artifact
     3: the geographical area in which one nation is very
        influential [syn: {sphere of influence}]
     4: a particular aspect of life or activity; "he was helpless in
        an important sector of his life" [syn: {sector}]
     5: a solid figure bounded by a spherical surface (including the
        space it encloses)
     6: a three-dimensional closed surface such that every point on
        the surface is equidistant from the center
     7: the apparent surface of the imaginary sphere on which
        celestial bodies appear to be projected [syn: {celestial
        sphere}, {empyrean}, {firmament}, {heavens}, {vault of
        heaven}, {welkin}]
Source: WordNet® 2.0