nouns
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"
any spherically shaped artifact
is a type of (narrower)
a man-made object taken as a whole
the geographical area in which one nation is very influential
a particular aspect of life or activity
"he was helpless in an important sector of his life"
a solid figure bounded by a spherical surface (including the space it encloses)
is a type of (narrower)
a shape that is curved and without sharp angles
a three-dimensional closed surface such that every point on the surface is equidistant from the center
is a type of (narrower)
a shape that is curved and without sharp angles
the apparent surface of the imaginary sphere on which celestial bodies appear to be projected