impetus

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impetus /ˈɪmpətəs/ noun
impetus
/ˈɪmpətəs/
noun
Learner's definition of IMPETUS
: a force that causes something (such as a process or activity) to be done or to become more active
[noncount]
[singular]
often + for
sometimes followed by to + verb
[noncount] technical : a force that causes an object to begin moving or to continue to move
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