Meaning of “impetus” in the English Dictionary

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"impetus" in American English

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impetusnoun [ U ]

us /ˈɪm·pət·̬əs/

a force that encourages a particular action or makes it more energetic or effective:

Often the impetus for change in education has had to come from outside the school establishment.

(Definition of “impetus” from the Cambridge Academic Content Dictionary © Cambridge University Press)