nounMathematics , dated
A function corresponding to the rate of change of a variable quantity; a derivative.
- He integrated Leibniz's differential calculus and Newton's method of fluxions into mathematical analysis.
- For Newton integration consisted of finding fluents for a given fluxion so the fact that integration and differentiation were inverses was implied.
- I still must assert that this discovery appears to me to be as important for the middle of the nineteenth century as the discovery of fluxions [the calculus] was for the close of the seventeenth.
Late 17th century: from French, or from Latin flux- 'flowed', from the verb fluere.
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