force, impulsion, spur, stimulus; see incentive, purpose 1, reason 3.
"impetus." YourDictionary, n.d. Web. 11 October 2018. <http://thesaurus.yourdictionary.com/impetus>.
impetus. (n.d.). Retrieved October 11th, 2018, from http://thesaurus.yourdictionary.com/impetus
Something that causes and encourages a given response:
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