a navigation service provided to aircraft by air traffic control.

a technology employed in automobile differentials that has the ability to vary the torque to each half-shaft with an electronic system; or in rail vehicles which achieve the same using individually motored wheels.

(aviation, astronautics) The deflection of the exhaust nozzle(s) of a jet engine or rocket so as to alter the direction in which the engine produces thrust and help control the attitude and/or direction of flight of the vehicle using the engine.