Source : Webster's Revised Unabridged Dictionary (1913)

Fluxion \Flux"ion\, n. [Cf. F. fluxion.]
   The act of flowing. --Cotgrave.

   2. The matter that flows. --Wiseman.

   3. Fusion; the running of metals into a fluid state.

   4. (Med.) An unnatural or excessive flow of blood or fluid
      toward any organ; a determination.

   5. A constantly varying indication.

            Less to be counted than the fluxions of sun dials.
                                                  --De Quincey.

   6. (Math.)
      (a) 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.
      (b) pl. 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.

Source : WordNet®

fluxion
     n : a flow or discharge [syn: {flux}]