from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A flow or flowing.
  • n. Continual change.
  • n. Archaic See derivative.
  • n. Archaic Differential calculus.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The derivative of a function
  • n. or (archaic) The action of flowing

from the GNU version of the Collaborative International Dictionary of English

  • n. The act of flowing.
  • n. The matter that flows.
  • n. Fusion; the running of metals into a fluid state.
  • n. An unnatural or excessive flow of blood or fluid toward any organ; a determination.
  • n. A constantly varying indication.
  • n.
  • n. The infinitely small increase or decrease of a variable or flowing quantity in a certain infinitely small and constant period of time; the rate of variation of a fluent; an incerement; a differential.
  • n. A method of analysis developed by Newton, and based on the conception of all magnitudes as generated by motion, and involving in their changes the notion of velocity or rate of change. Its results are the same as those of the differential and integral calculus, from which it differs little except in notation and logical method.

from The Century Dictionary and Cyclopedia

  • n. The act of flowing; fluxation; change.
  • n. That which flows; that which changes; a flux.
  • n. Specifically— In medicine: An abnormal flow or determination of blood or other humor to any organ, as the brain; active hyperemia. A catarrh.
  • n. The running or reduction of metals to a fluid state; fusion.
  • n. Something, as an indication, which constantly varies.
  • n. In mathematics, the rate of change of a continuously varying quantity; the differential coefficient relatively to the time.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a flow or discharge


from The American Heritage® Dictionary of the English Language, 4th Edition

French, from Late Latin flūxiō, flūxiōn-, from Latin flūxus, flux; see flux.


  • The fluxion of a fluent x is denoted by x·, and its moment, or “infinitely small increment accruing in an infinitely short time o”, by x·o.

    Continuity and Infinitesimals

  • Digesting its contents, particularly in the given form (in fluxion instead of normal calculus) could have taken months, if not years.

    Kant's Philosophical Development

  • Their bodies continually going up and down upon perpetual fluxion, they never could live if their minds did the same, like the minds of stationary landsmen.

    Mary Anerley

  • Then, like an overloaded video screen it slowly, slowly became a nauseous fluxion of repulsive colors-and it was squirming!

    The Dragon Lensman

  • From that journey he never returned alive, being attacked with a fatal fluxion of the lungs at a great public banquet given in his honor by Count Florida Blanca.

    Calvert of Strathore

  • Mademoiselle de Nantes is in fairly good health, yet it looks as if a return of her fluxion were likely.

    Court Memoirs of France Series — Complete

  • This questionable success was sufficient to lead M. de Puységur, a few days after, to try his hand on a young peasant of the name of Victor, who was suffering with a severe fluxion upon the chest.

    Blackwood's Edinburgh Magazine, Volume 62, No. 382, October 1847

  • All is as unsubstantial, as vague and shadowy, as Coleridge's "image of a rock," or Bishop Berkeley's "ghost of a departed quantity," as he once defined a fluxion.

    Life: Its True Genesis

  • He indulged himself in indolence and social pleasure, but was at the same time much devoted to reading; and enjoyed a tolerable good state of health, although often incommoded with a fluxion of rheum upon the eyes.

    The Lives of the Twelve Caesars, Volume 02: Augustus

  • You will think, perhaps, from this idle attempt, that I have some fluxion on my sight; no such matter; I have suffered myself to be persuaded by such sort of arguments as those by which people are induced to strict abstinence, or to take physic.

    Lady Mary Wortley Montague


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