fluxion

plural fluxions

1. countableobsoleteuncountablemathematicsThe derivative of a function.
2. archaiccountablerareuncountableThe 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. archaiccountablerareuncountableA difference or variation.

present singular third person fluxions · participle present fluxioning · participle past fluxioned · past fluxioned

1. geographyTo 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, →ISBN, page 142