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1Mathematics dated A function corresponding to the rate of change of a variable quantity; a derivative.
‘Leibniz demanded a retraction saying that he had never heard of the calculus of fluxions until he had read the works of Wallis.’
‘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.’
‘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.’
2archaic mass nounThe action or process of flowing or moving continuously; flux.
Origin
Mid 16th century: from French, or from Latin flux- ‘flowed’, from the verb fluere.