Great Circle
From EUROCONTROL ATM Lexicon
Link  Semantic Value 

Term  Great Circle 
Status 

Mandatory for 

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Synonyms 

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Narrower term 

Abbreviation
Definition
The shortest path between two points on a plane is a straight line. On the surface of a sphere, however, there are no straight lines. The shortest path between two points on the surface of a sphere is given by the arc of the great circle passing through the two points. A great circle is defined to be the intersection with a sphere of a plane containing the centre of the sphere.
Definition Source
SESAR Guidance on KPIs and Data Collection Version 1 (D85, Ed. 00.01.01, 2014)
Note
Lexicon Release
Lexicon Release 2015.1