sphere - definition and synonyms

noun [countable] 

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  1. 1
    maths an object that is shaped like a ball
  2. 2
    a particular area of interest, activity, work etc that is one of many parts of life
    the financial/political/scientific etc sphere:

    Let’s take this debate out of the political sphere and into the public arena.

    Women were beginning to take responsibility for things outside the domestic sphere.

  3. 3
    a group in society
    cultural/social sphere:

    They moved in different cultural spheres.

  4. 4
    an area of responsibility or a type of situation over which a person or group has influence or power

    They knew not to interfere in matters outside their sphere of operation.

    sphere of influence:

    The economic boom has greatly expanded the US’s sphere of influence.