Etymology
Advertisement
impact (v.)
c. 1600, "press closely into something," from Latin impactus, past participle of impingere "to push into, 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"). Original sense is preserved in impacted teeth. Sense of "strike forcefully against something" first recorded 1916. Figurative sense of "have a forceful effect on" is from 1935. Related: Impacting.
Related entries & more 
Advertisement
impact (n.)
1738, "collision, act of striking against, striking of one thing against another," from impact (v.). Figurative sense of "forceful impression" is from 1817 (Coleridge).
Related entries & more 
impacted (adj.)
1680s, "pressed closely in," past-participle adjective from impact (v.). Of teeth from 1859.
Related entries & more 
impactful (adj.)
1961, originally in advertising, from impact (n.) + -ful. Related: Impactfully; impactfulness.
Related entries & more 
*pag- 
also *pak-, Proto-Indo-European root meaning "to fasten."

It forms all or part of: Areopagus; appease; appeasement; compact (adj.) "concentrated;" compact (n.1) "agreement;" fang; impact; impale; impinge; newfangled; pace (prep.) "with the leave of;" pacific; pacify; pact; pagan; page (n.1) "sheet of paper;" pageant; pale (n.) "limit, boundary, restriction;" palette; palisade; patio; pawl; pax; pay; peace; peasant; pectin; peel (n.2) "shovel-shaped instrument;" pole (n.1) "stake;" propagate; propagation; travail; travel.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit pasa- "cord, rope," pajra- "solid, firm;" Avestan pas- "to fetter;" Greek pegnynai "to fix, make firm, fast or solid," pagos "pinnacle, cliff, rocky hill;" Latin pangere "to fix, to fasten," pagina "column," pagus "district;" Slavonic paž "wooden partition;" Old English fegan "to join," fon "to catch seize."
Related entries & more 
Advertisement
rammer (n.)

"instrument for driving by impact," mid-15c., agent noun from ram (v.).

Related entries & more 
thunk (n.)
sound of impact, attested from 1952, echoic.
Related entries & more 
buffer (v.)

"lessen the impact of," 1886, from buffer (n.). Related: Buffered; buffering.

Related entries & more 
bruise (n.)
"contusion without laceration, superficial injury caused by impact," 1540s, from bruise (v.).
Related entries & more 
buffer (n.1)
"something that absorbs a blow, apparatus for deadening the concussion between a moving body and that against which it strikes," 1835, agent noun from obsolete verb buff "make a dull sound when struck" (mid-16c.), from Old French bufe "a blow, slap, punch" (see buffet (n.2)). Figurative sense of "anything that prevents impact or neutralizes the shock of impact of opposing forces" is from 1858.
Related entries & more