noun the matter that flows.
2. fluxion ·noun a constantly varying indication.
3. fluxion ·noun the act of flowing.
4. fluxion ·noun fusion; the running of metals into a fluid state.
5. fluxion ·noun an unnatural or excessive flow of blood or fluid toward any organ; a determination.
6. fluxion ·noun 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.
7. fluxion ·noun 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.