Английский разговорный словарь (основной) - servo

ˈsə:vəu n. (pl. -os) 1 (in full servo-mechanism) a powered mechanism producing motion or forces at a higher level of energy than the input level, e.g. in the brakes and steering of large motor vehicles, esp. where feedback is employed to make the control automatic. 2 (in full servo-motor) the motive element in a servo-mechanism. 3 (in comb.) of or involving a servo-mechanism (servo-assisted). [L servus slave]