sphere definition

1. a particular environment or walk of life
• examples: his social sphere is limited
• examples: it was a closed area of employment
• examples: he's out of my orbit
2. any spherically shaped artifact
3. the geographical area in which one nation is very influential
4. a solid figure bounded by a spherical surface (including the space it encloses)
5. a three-dimensional closed surface such that every point on the surface is equidistant from the center