What is your definition of fluent ?

I define fluency as being able to reflexively use/understand the patterns of the language.

On top of that I have a strong enough vocabulary base that I can communicate around the words I don’t know and once I do know them, I can use them intuitively.

Seems pretty straight forward right? I like this definitions because it is rigid, but flexible to any language learning goal you need.

It even works for English. Yes I understand the English Grammar patterns for many situations, but I can not speak like a lawyer. I am not fluent in that part of English. Once I got used to the language patterns of Law and had a strong enough vocabulary base, I could easily say I am fluent in Law.

http://want2speakspanish.wordpress.com/2012/02/10/fluent/