Definitions for "Sphere of influence"
the area served by a settlement, shop or service.
the geographical area in which one nation is very influential
a planning tool adopted and used by LAFCO to designate the future boundary and service area for a city or special district
a region that a big power claims is of special importance to its national interest and over which the big power exercises special influence.
the area over which a society has economic and cultural influence
a metaphorical region of political influences surrounding a country