motive
noun
°An incentive to act; a reason for doing something; anything that prompted a choice of action.
"What would his motive be for burning down the cottage?"
°A motif; a theme or subject, especially one that is central to the work or often repeated.
"If you listen carefully, you can hear the flutes mimicking the cello motive."
verb
°To prompt or incite by a motive or motives; to move.
adjective
°Causing motion; having power to move, or tending to move; as, a motive argument; motive power.
°Relating to motion and/or to its cause.
synonyms: motivation, motif, motivate, moving more» , motional