- (obsolete, mathematics) The derivative of a function.
- (rare or archaic) The action of flowing.
- (rare or archaic) A difference or variation.
- (geology) To be distributed in a flowing pattern.
- 1982, Charles James Hughes, Igneous petrology, →ISBN, page 142:
- ...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).