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A function corresponding to the rate of change of a variable quantity; a derivative.
‘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.’
‘Leibniz demanded a retraction saying that he had never heard of the calculus of fluxions until he had read the works of Wallis.’
‘He integrated Leibniz's differential calculus and Newton's method of fluxions into mathematical analysis.’
‘He calls the quantity generated by a motion a fluent, and its rate of generation a fluxion.’
Origin
Late 17th century: from French, or from Latin flux- ‘flowed’, from the verb fluere.