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 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.