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.
I don't know what makes a writer's voice. It's dozens of things. There are people who write who don't have it. They're tone-deaf, even though they're very fluent. It's an ability, like anything else, being a doctor or a veterinarian, or a musician. Paula Fox