sphere

A surface in three dimensions consisting of all points equidistant from a center. .

An object which appears to be bounded by a sphere; a round object, a ball.

The celestial sphere: the edge of the heavens, imagined as a hollow globe within which celestial bodies appear to be embedded.

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).

An area of activity for a planet; or by extension, an area of influence for a god, hero etc.

The region in which something or someone is active; one's province, domain.

The natural, normal, or proper place (of something).

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 .

The domain of reference of a proposition, subject, or predicate, or the totality of the particular subjects to which it applies.