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impact

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noun American English pronunciation: impact /ˈɪmˌpækt/ 
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singularimpact
pluralimpacts

Related dictionary definitions

  1. 1
    [countable] an effect, or an influence

    Her paper discusses the likely impact of global warming on climate change.

    Tougher environmental laws could have negative impacts on economic growth.

    impact on:

    Internet shopping has begun to have a serious impact on the traditional bookstores.

    make an impact:

    She's an excellent athlete who is already making a real impact in world competition.

  2. 2
    [countable/uncountable] an occasion when one object hits another

    the point of impact

    on impact:

    The missile exploded on impact.

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