Thrust
The aerodynamic force produced by a propeller or turbojet engine as it forces a mass of air to the rear, behind the aircraft. A propeller produces its thrust by accelerating a large mass of air by a relatively small amount. A turbojet engine produces its thrust by accelerating a smaller mass of air by a much larger amount.
Aviation Maintenance Technician Handbook — Powerplant, p. G-28
Also defined in 3 more sources
The force developed by the rotor blades acting parallel to the relative wind and opposing the forces of drag and weight.
The force which imparts a change in the velocity of a mass. This force is measured in pounds but has no element of time or rate. The term “thrust required” is generally associated with jet engines. A forward force which propels the airplane through the air.
The forward aerodynamic force produced by a propeller, fan, or turbojet engine as it forces a mass of air to the rear, behind the aircraft.
Taught in PP-K Concepts, PP-B Concepts, PP-L Concepts, PP-L Quick reference.