third-speed gear

third country national (TCN)

third-party logistics (services support) (TPLSS / 3PL)

3PL (third-party logistics)

captain third rank

one-third octave band system

third-party accident

third order intermodulation

third-class road

third echelon maintenance

supersonic speed (exceeds speed of sound / Mach 1)

variable-speed with speed control

instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)

cruise speed / cruising speed

Nr gauge (Nr = speed of rotation) / rotor speed sensor

gear speed decreaser

idler direct speed gear

direct speed gear

fourth and fifth speed gear synchronizer

landing gear placard speed

camshaft gear (timing gear)

gear reduction unit / gear-reduction unit

apparent speed

average speed

blade speed

convoy speed

critical speed

cross-country speed

endurance speed

exhaust speed

full speed (naut.)

group transit speed

high-speed antiradiation missile (HARM)