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.

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).

updated on May 07, 2017

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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, not affiliated with etymonline.