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
- redirect great circle