1739, from Latin impactionem (nominative impactio) "a striking against," noun of action from past participle stem of impingere "drive into, strike against" (see impinge).
Entries linking to impaction
impinge v.
1530s, "fasten or fix forcibly," from Latin impingere "drive into, strike against," from assimilated form of in- "into, in, on, upon" (from PIE root *en "in") + pangere "to fix, fasten" (from PIE root *pag- "to fasten"). Sense of "encroach, infringe" first recorded 1738. Related: Impinged; impinging; impingent.