what is a geodasic
â¢ GEODESIC (noun). The noun GEODESIC has 1 sense: 1. (mathematics) the shortest line between two points on a mathematically defined surface (as a straight line on a plane or an arc of a great circle on a sphere). Familiarity information: GEODESIC used as a noun is very rare.â¢ GEODESIC (adjective).. (mathematics) the shortest line between two points on a mathematically defined surface (as a straight line on a plane or an arc of a great circle on a sphere). Familiarity information: GEODESIC used as a noun is very rare. â¢ GEODESIC (adjective).