The act of impelling or the condition of being impelled: "I do not move . . . unless it be under the impulsion of a third party" (Samuel Beckett).
An impelling force; a thrust.
Motion produced by an impelling force; momentum.
A wish or urge from within; an impulse.
impulsion im·pul·sion (ĭm-pŭl'shən) n. An urge to perform certain actions without regard for internal or social constraints.