motive

[1]	inducement , motivation , need , incentive , motivation , stimulus , motivating force , stimulation , incitement , influence , cause , reason , rationale , grounds , attraction , lure , enticement , goad , spur , urge , prod
[2]	purpose , motif , aim , intention , intent , object , objective , goal , end , ambition , desire , (Colloq) angle
[3]	motif

adj.

[1]	driving , impelling , propelling , propulsive , moving , kinetic , activating , operative
[2]	motor
[3]	motivative , motivating