I've always liked the 'seinfeld' definition of fluency: If you can watch a local sitcom on TV and laugh at the jokes, then you're fluent. That may be a bit ha

I've always liked the 'seinfeld' definition of fluency: If you can watch a local sitcom on TV and laugh at the jokes, then you're fluent. That may be a bit harder to test for, but it adds an element of cultural understanding that goes beyond textbook skills.