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.