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1. (Aeronautics) the personnel, radar, computers, etc, on the ground that monitor the progress of aircraft or spacecraft
2. (Aeronautics) a system for feeding continuous radio messages to an aircraft pilot to enable him to make a blind landing
an airport facility that supervises the movement of aircraft and ground vehicles on ramps and taxiways.
ground′ control`ler, n.
A system of accurate measurements used to determine the distances and directions or differences in elevation between points on the Earth. See also common control (artillery); control point; traverse.