ScienceJuly 7, 2026
impetus
/ˈɪmpɪtəs/
Definition
A motivating force or stimulus that causes a process to begin or happen more quickly.
Etymology
Derived from the Latin word 'impetus', meaning 'assault' or 'attack', which comes from the verb 'impetere' (to attack or rush upon). It entered English in the 17th century to denote a driving physical force before evolving to describe a psychological or situational motivation.
In the news
The tragic Mann Gulch fire served as the impetus that finally compelled the US Forest Service to establish dedicated research programs for studying fire behavior. It acts as the catalyst that spurred systemic scientific change in response to disaster.
Megafires, Land Use, and Climate Change
Read the full article ↗The Equation - Union of Concerned Scientists