Webster's Revised Unabridged Dictionary · 1913

Impact

Impact , transitive verb

[Latin impactus, past participle of impingere to push, strike against. See Impinge.]

1.
To drive close; to press firmly together: to wedge into a place. — Woodward
2.
To affect or influence, especially in a significant or undesirable manner; as, budget cuts impacted the entire research program; the fish populations were adversely impacted by pollution.
3.
To collide forcefully with; to strike.

Impact , noun

1.
Contact or impression by touch; collision; forcible contact; force communicated.
The quarrel, by that impact driven. — Southey
2.
(Mechanics) The single instantaneous stroke of a body in motion against another either in motion or at rest.