Noun
The act of impelling or driving onward, or the state of being impelled; the sudden or momentary agency of a body in motion on another body; also, the impelling force, or impulse.
Influence acting unexpectedly or temporarily on the mind; sudden motive or influence; impulse.
Source: Webster's dictionaryA cloud does not know why it moves in just such a direction and at such a speed, it feels an impulsion... this is the place to go now. But the sky knows the reason and the patterns behind all clouds, and you will know, too, when you lift yourself high enough to see beyond horizons. Richard Bach
An army is to a chief what a sword is to a soldier. It is only worth anything in so far as it receives from him a certain impulsion (direction and vigour). Ferdinand Foch
the impulse knocked him over Source: Internet
Also, in show jumping, a horse is asked to move with impulsion and engagement; this makes the jump more fluent, brings the horse to bascule more correctly, and is less jarring for both horse and rider. Source: Internet
The scores for the general attributes of gait, submission, impulsion, and rider performance mentioned above are scored using a coefficient. Source: Internet