1.Definition: a particular aspect of life or activity

Related Noun(s):sector

Category: General

2.Definition: 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"

Related Noun(s):area, arena, domain, field, orbit

Category: General

3.Definition: a solid figure bounded by a spherical surface (including the space it encloses)

Category: General

4.Definition: a three-dimensional closed surface such that every point on the surface is equidistant from the center

Category: General

5.Definition: any spherically shaped artifact

Category: Objects

6.Definition: the apparent surface of the imaginary sphere on which celestial bodies appear to be projected

Related Noun(s):celestial sphere, empyrean, firmament, heavens, vault of heaven, welkin

Category: Places

7.Definition: the geographical area in which one nation is very influential

Related Noun(s):sphere of influence

Category: Places