sphere

noun

1. 1

   any spherically shaped artifact

2. 2

   a particular aspect of life or activity

   he was helpless in an important sector of his life

3. 3

   the apparent surface of the imaginary sphere on which celestial bodies appear to be projected

4. 4

   the geographical area in which one nation is very influential

5. 5

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

6. 6

   a solid figure bounded by a spherical surface (including the space it encloses)

7. 7

   a particular environment or walk of life

   his social sphere is limited

   it was a closed area of employment