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The Collaborative International Dictionary of English v.0.48 (gcide)

Fluxion \Flux"ion\, n. [Cf. F. fluxion.]
The act of flowing. --Cotgrave.
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2. The matter that flows. --Wiseman.
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3. Fusion; the running of metals into a fluid state.
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4. (Med.) An unnatural or excessive flow of blood or fluid
toward any organ; a determination.
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5. A constantly varying indication.
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Less to be counted than the fluxions of sun dials.
--De Quincey.
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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.
[1913 Webster]

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