impact - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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impact

noun [C usually singular, U] uk   us   /ˈɪm.pækt/
C2 the force or action of one object hitting another: The impact of the crash reduced the car to a third of its original length. The bullet explodes on impact (= when it hits another object).B2 a powerful effect that something, especially something new, has on a situation or person: The anti-smoking campaign had had/made quite an impact on young people. The new proposals were intended to soften the impact of the reformed tax system.
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impact

verb [I or T] uk   us   /ɪmˈpækt/ mainly US
C1 to have an influence on something: Falling export rates have impacted (on) the country's economy quite considerably.
(Definition of impact from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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