impact - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “impact”

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impact

noun [U]  us   /ˈɪm·pækt/

impact noun [U] (FORCE)

the force with which one thing hits another or with which two things hit each other: The impact of the crash destroyed the car. The bullet explodes on impact (= at the moment when it hits something).

impact noun [U] (EFFECT)

the strong effect or influence that something has on a situation or person: These charges will have a damaging impact on the army’s reputation. The environmental impact of this project will be enormous.

impact

 us   /ɪmˈpækt/

impact (HAVE EFFECT)

to have a strong effect or influence on a situation or person: [I/T] A big decline in exports will impact (on) the country’s economy.
(Definition of impact from the Cambridge Academic Content Dictionary © Cambridge University Press)
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