Definitions of sphere:

  • 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