force, impulsion, spur, stimulus; see incentive, purpose 1, reason 3.
"impetus." YourDictionary, n.d. Web. 14 January 2019. <https://thesaurus.yourdictionary.com/impetus>.
impetus. (n.d.). Retrieved January 14th, 2019, from https://thesaurus.yourdictionary.com/impetus
Something that causes and encourages a given response:
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