Sphere (band) definition

(1) Any spherically shaped artifact

(2) A particular aspect of life or activity

"He was helpless in an important sector of his life"

(3) The apparent surface of the imaginary sphere on which celestial bodies appear to be projected

(4) The geographical area in which one nation is very influential

(5) A three-dimensional closed surface such that every point on the surface is equidistant from the center

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

(7) 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"