All 5 Uses

motive
in
Here, There be Dragons by Owen
(Auto-generated)

The ship, intuitive as ever, called upon her unique motive power and made full speed away from the fray.†
Chpt 2.5 *

motive = reason (for doing something)
No—I mean, what gives it motive power?†
Chpt 2.6
What gives you motive power?†
Chpt 2.6
With the ease born of a superior motive power, the Black Dragon glided alongside the Indigo Dragon and aimed a brace of cannons at her.†
Chpt 3.9
Not all of the motive power would come from the winds.†
Chpt 4.16

Definitions:

(1) (motive as in: What is her motive?)
a reason for doing something
(2) (meaning too rare to warrant focus)
Less commonly, motive can refer to something that causes motion in an inanimate object. Even less commonly, it can refer to a distinctive feature in music, art, or literature.