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Definition of impact noun from the Oxford Advanced American Dictionary

        

    impact

     noun
    noun
    NAmE//ˈɪmpækt//
     
    [countable, usually singular, uncountable]
     
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  1. 1impact (of something) (on somebody/something) the powerful effect that something has on someone or something the environmental impact of tourism The report assesses the impact of AIDS on the gay community. Her speech made a profound impact on everyone. Businesses are beginning to feel the full impact of the recession. social support to cushion the impact of unemployment
  2. 2the act of one object hitting another; the force with which this happens craters made by meteorite impacts The impact of the blow knocked Jack off balance. The bomb explodes on impact (= when it hits something). The car is fitted with side impact bars (= to protect it from a blow from the side).
See the Oxford Advanced Learner's Dictionary entry: impact

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