n. One who or that which imparts motion; a source or originator of mechanical power; a moving power, as water, steam, etc.n. Specificallyn. In mathematics, an operator or a quantity which represents the displacement of a rigid body.n. In machinery, a prime mover; a contrivance for developing and applying mechanically some natural force, as heat, pressure, weight, the tide, or the wind; a machine which transforms the energy of water, steam, or electricity into mechanical energy: as, an electric motor. See machine, 2.n. In anatomy, specifically, a motor nerve.Giving motion; imparting motion.In physiology, conveying from the center toward the periphery an impulse that results or tends to result in motion, as a nerve: opposed to sensory.Of or pertaining to or acting through the motor nerves or tracts.n. A motor-car.n. In anatomy, specifically, a motor nerve.n. An alternating-current motor in which the wattless current is compensated by a condenser or by auxiliary commutator-brushes; a compensated repulsion-motor.