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impetus

im·pe·tus

impetus

 
 
pronunciation:
Im p ts
part of speech: noun
inflections: impetuses
definition 1: something that urges or impels; a driving force.
The scandal turned out to be an impetus for reform.
similar words:
animus, dynamic, spur
definition 2: the force or energy of motion; momentum.
the impetus of the rolling car
similar words:
momentum