Im*pul"sion (?), n. [L. impulsio: cf. F. impulsion. See Impel.]

1. 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. "The impulsion of the air." Bacon.

2. Influence acting unexpectedly or temporarily on the mind; sudden motive or influence; impulse. "The impulsion of conscience." Clarendon. "Divine impulsion prompting." Milton.