motor

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Something, such as a machine or an engine, that produces or imparts motion.
• noun A device that converts any form of energy into mechanical energy, especially an internal-combustion engine or an arrangement of coils and magnets that converts electric current into mechanical power.
• noun A motor vehicle, especially an automobile.
• adjective Causing or producing motion.
• adjective Driven by or having a motor.
• adjective Of or for motors or motor vehicles.
• adjective Of, relating to, or designating nerves that carry impulses from the nerve centers to the muscles.
• adjective Involving or relating to movements of the muscles.
• intransitive verb To drive or travel in a motor vehicle.
• intransitive verb To carry by motor vehicle.

from The Century Dictionary.

• noun A motor-car.
• noun In anatomy, specifically, a motor nerve.
• noun An alternating-current motor in which the wattless current is compensated by a condenser or by auxiliary commutator-brushes; a compensated repulsion-motor.
• noun One who or that which imparts motion; a source or originator of mechanical power; a moving power, as water, steam, etc.
• noun Specifically
• noun In mathematics, an operator or a quantity which represents the displacement of a rigid body.
• noun 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.
• noun 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.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who, or that which, imparts motion; a source of mechanical power.
• noun (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.
• noun archiac Colloq. A motor car; an automobile.
• adjective 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A machine or device that converts any form of energy into mechanical energy, or imparts motion.
• noun colloquial A motor car, or automobile.
• noun figuratively A source of power for something, an inspiration, a driving force.
• adjective biology describing neurons that create the ability to move
• verb To drive around leisurely in a motorised vehicle.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a nonspecific agent that imparts motion
• verb travel or be transported in a vehicle
• noun machine that converts other forms of energy into mechanical energy and so imparts motion
• adjective conveying information to the muscles from the CNS
• adjective causing or able to cause motion