(noun.) any spherically shaped artifact.
(noun.) the geographical area in which one nation is very influential.
(noun.) a three-dimensional closed surface such that every point on the surface is equidistant from the center.
(noun.) a solid figure bounded by a spherical surface (including the space it encloses).
(noun.) 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'.
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