Fluent

Flowing or capable of flowing; liquid; glodding; easily moving.

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.

A current of water; a stream.

A variable quantity, considered as increasing or diminishing; -- called, in the modern calculus, the function or integral.