1. (n.) The act of impelling, or driving onward with sudden force; impulsion; especially, force so communicated as to produced motion suddenly, or immediately.

2. (n.) The effect of an impelling force; motion produced by a sudden or momentary force.

3. (n.) The action of a force during a very small interval of time; the effect of such action; as, the impulse of a sudden blow upon a hard elastic body.

4. (n.) A mental force which simply and directly urges to action; hasty inclination; sudden motive; momentary or transient influence of appetite or passion; propension; incitement; as, a man of good impulses; passion often gives a violent impulse to the will.

5. (v. t.) To impel; to incite.

actuation archetypal pattern archetype atomic power automatic writing automatism blind impulse catalyst collective unconscious compulsion compulsiveness conditioning constraint drive echolalia echopraxia electric power electropower excitant exigency forwardness goad haste hastiness horsepower hydraulic power hydroelectric power id impetus impulsion impulsiveness inborn proclivity incentive incitation incitement instinct instinctiveness involuntariness jet power libido lust manpower motivation natural instinct natural tendency nuclear power overhastiness passion pinch piston power precipitation precociousness precocity prematureness prematurity press pressure primitive self propulsion push rash impulse reflex action rocket power rush sheer chemistry solar power spur steam power stimulant stress subconscious urge thermonuclear power thrust unlearned capacity unreasoning impulse untimeliness unwilledness urge urgency vital impulse water power