Definitions from Wiktionary ( )

▸ noun:  (mathematics) A surface in three dimensions consisting of all points equidistant from a center. .
▸ noun:  An object which appears to be bounded by a sphere; a round object, a ball.
▸ noun:  (astronomy, now rare) The celestial sphere: the edge of the heavens, imagined as a hollow globe within which celestial bodies appear to be embedded.
▸ noun:  (historical, astronomy, mythology) Any of the concentric hollow transparent globes formerly believed to rotate around the Earth, and which carried the heavenly bodies; there were originally believed to be eight, and later nine and ten; friction between them was thought to cause a harmonious sound (the music of the spheres).
▸ noun:  (mythology) An area of activity for a planet; or by extension, an area of influence for a god, hero etc.
▸ noun:  (figuratively) The region in which something or someone is active; one's province, domain.
▸ noun:  The natural, normal, or proper place (of something).
▸ noun:  (geometry) The set of all points in three-dimensional Euclidean space (or n-dimensional space, in topology) that are a fixed distance from a fixed point .
▸ noun:  (logic, dated) The domain of reference of a proposition, subject, or predicate, or the totality of the particular subjects to which it applies.
▸ verb:  (transitive) To place in a sphere, or among the spheres; to ensphere.
▸ verb:  (transitive) To make round or spherical; to perfect.

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