Etymology
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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.

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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).

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impacted (adj.)

1680s, "pressed closely in," past-participle adjective from impact (v.). Of teeth from 1859.

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impactful (adj.)

1961, originally in advertising, from impact (n.) + -ful. Related: Impactfully; impactfulness.

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*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."

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thunk (n.)

sound of impact, attested from 1952, echoic.

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rammer (n.)

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

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buffer (v.)

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

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bullet-proof (adj.)

also bulletproof, "capable of resisting the impact of a bullet," 1816, from bullet (n.) + proof (n.).

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bruise (n.)

"contusion without laceration, superficial injury caused by impact," 1540s, from bruise (v.).

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