definition of
sphere

[1] #1 sphere n. [domain, area, orbit, field, arena] 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". wn

[2] #2 sphere n. any spherically shaped artifact. wn

[3] #3 sphere n. [sphere of influence] the geographical area in which one nation is very influential. wn

[4] #4 sphere n. [sector] a particular aspect of life or activity; "he was helpless in an important sector of his life". wn

[5] #5 sphere n. a solid figure bounded by a spherical surface (including the space it encloses). wn