Definition of “sphere” - English Dictionary

“sphere” in American English

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spherenoun [ C ]

us /sfɪər/

sphere noun [ C ] (ROUND OBJECT)

geometry a solid shape like a round ball:

This changes the shape of the cornea from a spoonlike form to a sphere.

sphere noun [ C ] (AREA)

a range or area of activity:

In the foreign policy sphere, Li also indicated that China is ready to include human rights in its diplomacy.
When the children played they always remained within the sphere of their own little group.

(Definition of “sphere” from the Cambridge Academic Content Dictionary © Cambridge University Press)