great-circle course[′grāt ¦sər·kəl ′kȯrs]
Course along the direction of the great circle through the departure point and the destination; expressed as the angular distance from a reference direction, usually north to the direction of the great circle; the angle varies from point to point along the great circle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The route between two points on the earth's surface measured along the shortest segment of the circumference of the great circle on which the two points are located. A great circle establishes the shortest distance over the surface of the earth between any two terrestrial points.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved