• 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

  Example: "His social sphere is limited"

• noun:   a particular aspect of life or activity
• noun:   the apparent surface of the imaginary sphere on which celestial bodies appear to be projected

Related words...