Great Circle Definition

noun
Any circle described on the surface of a sphere by a plane which passes through the center of the sphere; specif., such a circle on the earth's surface: a course (great-circle course) plotted along a great circle of the earth is the shortest route between any two points on the earth's surface.
Webster's New World
A segment of such a circle representing the shortest distance between two terrestrial points.
American Heritage

Other Word Forms of Great Circle

Noun

Singular:
great circle
Plural:
great-circles

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great circle