( a. )
A great circle on the surface of the earth, passing through the poles and any given place; also, the half of such a circle included between the poles.
( a. )
A great circle on the surface of the earth, passing through the poles and any given place; also, the half of such a circle included between the poles.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012