1. (a.) Ready in the use of words or languages; as, a fluent speaker; hence, flowing; voluble; smooth; -- said of language; as, fluent speech.

2. (a.) Flowing or capable of flowing; liquid; easily moving.

3. (n.) A current of water; a stream.

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