Definition of "Motor" :

noun: machine that converts other forms of energy into mechanical energy and so imparts motion

noun: a nonspecific agent that imparts motion

"Happiness is the aim of all men and the motor of all action."

verb: travel or be transported in a vehicle

"They motored to London for the theater."

adjective: causing or able to cause motion

"Motor energy."

adjective: conveying information to the muscles from the CNS

"Motor nerves."