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Motor

n.
  1. One who, or that which, imparts motion; a source of mechanical power.
  2. (Mach.) A prime mover; a machine by means of which a source of power, as steam, moving water, electricity, etc., is made available for doing mechanical work.
  3. A motor car; an automobile.

a.
  1. Causing or setting up motion; pertaining to organs of motion; -- applied especially in physiology to those nerves or nerve fibers which only convey impressions from a nerve center to muscles, thereby causing motion.