Impact \Im"pact\, n.

1. Contact or impression by touch; collision; forcible contact; force communicated.

The quarrel, by that impact driven. --Southey.

2. (Mech.) The single instantaneous stroke of a body in motion against another either in motion or at rest.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Impact \Im*pact"\, v. t. [imp. & p. p. Impacted; p. pr. & vb. n. Impacting.]

[L. impactus, p. p. of impingere to push, strike against. See Impinge.]

To drive close; to press firmly together: to wedge into a place. --Woodward.

Source: Webster's Revised Unabridged Dictionary (1913)