fluxion

Etymology

From Middle French fluxion, from Late Latin fluxiō, from Latin flūxus + -iō.

noun

1. (obsolete, mathematics) The derivative of a function.
2. (rare or archaic) The action of flowing.
   Perhaps he meant that towns are after all excrescences, grey fluxions, where men, hurrying to find one another, have lost themselves. 1907, E.M. Forster, The Longest Journey, Part III, XXXIII [Uniform ed., p. 299]
3. (rare or archaic) A difference or variation.

verb

1. (geology) To be distributed in a flowing pattern.
   ...pilotaxitic texture connotes abundant plagioclase microlites prominently fluxioned in an overall sub-parallel manner and locally around phenocrysts (but strictly in a holocrystalline non-glassy matrix). 1982, Charles James Hughes, Igneous petrology, page 142