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Wiktionary
great circle

n. 1 (context geometry English) A circle defined as the intersection of the surface of a sphere and a plane which passes through the centre of the sphere. 2 A segment of such circle representing the shortest distance between two points on the surface of a sphere.

WordNet
great circle

n. a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center

Wikipedia
Great Circle
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