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sphere of influence

sfir v In flu ihns
part of speech: noun
definition 1: foreign territory over which a state or nation exerts cultural, political, economic, or military authority.
definition 2: an area of activity over which one has power or control.
definition 3: in astronomy, the region around a celestial body within which the primary gravitational force on an orbiting object is that body.
The moon is within the Earth's sphere of influence.