n. One who makes speed; one who advances rapidly, or who gains success.n. One who or that which moves with great swiftness, as a horse.n. One who or something which promotes speed; specifically, some mechanical contrivance for quickening speed of motion or operation; any speeding device in a machine, as a pair of speed-cones or cone-pulleys. See speed-multiplier.n. In cotton manufacturing, a machine which takes the place of the bobbin and fly-frame, receiving the slivers from the carders, and twisting them into rovings.n. A regulator or governor for controlling the revolutions of a machine, such as an electric motor.