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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.

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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Definitions of impact from WordNet
1
impact (n.)
the striking of one body against another;
impact (n.)
a forceful consequence; a strong effect;
the book had an important impact on my thinking
Synonyms: wallop
impact (n.)
influencing strongly;
impact (n.)
the violent interaction of individuals or groups entering into combat;
Synonyms: shock
2
impact (v.)
press or wedge together; pack together;
impact (v.)
have an effect upon;
Synonyms: affect / bear upon / bear on / touch on / touch
From wordnet.princeton.edu