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a. A flow or flowing.
b. Continual change.
2. Archaic
b. fluxions Differential calculus.

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

flux′ion·al adj.
flux′ion·al·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Mathematics) maths obsolete the rate of change of a function, esp the instantaneous velocity of a moving body; derivative
2. a less common word for flux1, flux2
[C16: from Late Latin fluxiō a flowing]
ˈfluxional, ˈfluxionary adj
ˈfluxionally adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈflʌk ʃən)

1. an act of flowing; flow or flux.
2. continuous change.
3. Math. the derivative relative to the time.
[1535–45; < Middle French < Late Latin fluxiō, for Latin fluctio]
flux′ion•al, flux′ion•ar•y, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.fluxion - a flow or discharge
flow, flowing - the motion characteristic of fluids (liquids or gases)
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