Webster's Revised Unabridged Dictionary · 1913

Fluent

Fluent , adjective

[Latin fluens, -entis, present participle of fluere to flow; compare Greek {not transcribed} to boil over. Compare Fluctuate, Flux.]

1.
Flowing or capable of flowing; liquid; glodding; easily moving.
2.
Ready in the use of words; voluble; copious; having words at command; and uttering them with facility and smoothness; as, a fluent speaker; hence, flowing; voluble; smooth; -- said of language; as, fluent speech.
With most fluent utterance. — Denham
Fluent as the flight of a swallow is the sultan's letter. — De Quincey

Fluent , noun

1.
A current of water; a stream. [Obsolete]
2.
(Mathematics) A variable quantity, considered as increasing or diminishing; -- called, in the modern calculus, the function or integral.