Is acceptability a meta-tag as described in http://blog.stackoverflow.com/2010/08/the-death-of-meta-tags/?
- If the tag can’t work as the only tag on a question, it’s probably a meta-tag. Every tag you use should be able to work, more or less, as the only tag on a question. Meta-tags, like [beginner], [subjective], and [best-practices], are useless by themselves — they tell you nothing at all about the content of the question.
I would take a bet that if a question was asked with only acceptability, it would be retagged within about 5-10 minutes to add something else. So in other words, yes.
Not quite; acceptability is fairly clear, but the meaning of it is debatable.