noun see: feather Date: 1641 1. a. a driving force ; impulse , incentive , stimulus , stimulation or encouragement resulting in increased activity, the property possessed by a moving body in virtue of its mass and its motion
IMPETUS
Meaning of IMPETUS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012