A machine, especially one powered by electricity or internal combustion, that supplies motive power for a vehicle or for some other device with moving parts.
The car's motor was making a strange noise, so I took it to the mechanic.
Informal, chiefly British: a motor vehicle, especially a car.
He bought a second-hand motor for commuting to work.
Physiology: a motor nerve or neuron that conveys impulses producing movement.
Degeneration of the spinal motors can result in muscle weakness.