Fluxion

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${\displaystyle \int _{a}^{b}f'(t)\,dt=f(b)-f(a)}$
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A fluxion is the instantaneous rate of change, or gradient, of a fluent (a time-varying quantity, or function) at a given point.^[1] Fluxions were introduced by Isaac Newton to describe his form of a time derivative (a derivative with respect to time). Newton introduced the concept in 1665 and detailed them in his mathematical treatise, Method of Fluxions.^[2] Fluxions and fluents made up Newton's early calculus.^[3]