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impetus

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noun [singular/uncountable] British English pronunciation: impetus /ˈɪmpɪtəs/
  1. 1
    a force that helps something to happen or develop more quickly
    impetus for:

    The committee's report may provide further impetus for reform.

    gain/lose impetus:

    The peace process has been steadily gaining impetus.

    give/add/bring impetus to something:

    The document will give fresh impetus to the debate.

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