Definify.com

Webster 1913 Edition

Noun.

Fluency.

[Obs.]

Milton.

, for fluency, is not used.

fluence ‎(plural fluences)

(obsolete) Fluency.
a voluble and smart fluence of tongue — Milton.
(physics) A measure of particle flux (or that of a pulse of electromagnetic radiation).

A measure of particle flux

Shortened form of influence.

fluence ‎(plural fluences)

A magical or mysterious force; hypnotic power; energy.
- 1974, GB Edwards, The Book of Ebenezer Le Page, New York 2007, p. 191:
  I don't say she would have done anything, if it had come to the point; but the fluence was on, and she got me hot.