1. (

• sphere ,
• 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" ;

2. (

• sphere

) any spherically shaped artifact ;

3. (

• sphere ,
• sphere_of_influence

) the geographical area in which one nation is very influential ;

4. (

• sector ,
• sphere

) a particular aspect of life or activity; "he was helpless in an important sector of his life" ;

5. (

• sphere

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

6. (

• sphere ,

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

7. (

• celestial_sphere ,
• sphere ,
• empyrean ,
• firmament ,
• heavens ,
• vault_of_heaven ,
• welkin

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