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  1. Oxford American Dictionary

    great circle

    • IPA[ˌɡrāt ˈsərk(ə)l]

    美式

    • n.
      a circle on the surface of a sphere which lies in a plane passing through the sphere's center. As it represents the shortest distance between any two points on a sphere, a great circle of the earth is the preferred route taken by a ship or aircraft.

    • noun: great circle, plural noun: great circles