Definitions
1.NounA surface in three dimensions consisting of all points equidistant from a center. .mw-parser-output .defdate{font-size:smaller}.
2.NounAn object which appears to be bounded by a sphere; a round object, a ball.
3.NounThe celestial sphere: the edge of the heavens, imagined as a hollow globe within which celestial bodies appear to be embedded.
4.NounAny 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).
5.NounAn area of activity for a planet; or by extension, an area of influence for a god, hero etc.
6.NounThe region in which something or someone is active; one's province, domain."sphere of influence"
7.NounThe natural, normal, or proper place (of something)."in one's sphere"
8.NounThe set of all points in three-dimensional Euclidean space (or n-dimensional space, in topology) that are a fixed distance from a fixed point .
9.NounThe domain of reference of a proposition, subject, or predicate, or the totality of the particular subjects to which it applies.
10.VerbTo place in a sphere, or among the spheres; to ensphere.
11.VerbTo make round or spherical; to perfect.