sphere
noun OPAL W
  /sfɪə(r)/
  /sfɪr/
enlarge image(geometry) a solid figure that is completely round, with every point on its surface at an equal distance from the centre- The Earth is not a perfect sphere.
 
- any object that is completely round, for example a ball                                     
 - an area of activity, influence or interest; a particular section of society synonym domain
- the political sphere
 - This area was formerly within the sphere of influence of the US.
 - He and I moved in totally different social spheres.
 
Extra Examples- Rome's sphere of influence extended across Europe, North Africa and the Middle East.
 - Rome's sphere of influence extended as far as Scotland.
 - His work is little known outside the academic sphere.
 - In the novel, men and women enjoy separate spheres of action.
 - The matter is outside my sphere of responsibility.
 - The region is within the Russian sphere of influence.
 - Debate should be confined to the sphere of economics rather than politics.
 - The government had control over all spheres of life.
 
Oxford Collocations Dictionaryadjective- wider
 - separate
 - academic
 - …
 
- in somebody’s/the sphere
 - within somebody’s/the sphere
 - outside somebody’s/the sphere
 - …
 
- a sphere of activity
 - a sphere of influence
 - a sphere of life
 - …
 
 - -sphere(in nouns) a region that surrounds a planet, especially the earth
- ionosphere
 - atmosphere
 
 
Word OriginMiddle English: from Old French espere, from late Latin sphera, earlier sphaera, from Greek sphaira ‘ball’.
