impulsion
noun /ɪmˈpʌlʃn/
/ɪmˈpʌlʃn/
(formal)- [countable] a strong desire to do something
- [uncountable] a reason for doing something
- Lack of food and water provided much of the impulsion for their speed.
Word Originlate Middle English (in the sense ‘the action or an instance of impelling’): via Old French from Latin impulsio(n-), from the verb impellere, from in- ‘towards’ + pellere ‘to drive’.