Dictionary Definition
fluxion n : a flow or discharge [syn: flux]
Extensive Definition
Fluxion may refer to:
 An alternate spelling of fluxon, a quantum of magnetic flux, such as in a superconductor
 Fluxion was Isaac Newton's term for the derivative of a "fluent", or continuous function.

 Method of Fluxions, Isaac Newton's terminology for differential calculus
 Newton's notation for differentiation
 Newton's method for solving an equation
fluxion in French: Fluxion