Counterexamples to a definition are easier than a definition. See, e.g.:
But they don't solve the problem of Wikipedia being in your judgement wrong about this point.
re: the rest of your post, words mean things. B is a technical term.
If you look at the dictionary you will find that most words have multiple meanings.They also happen to evolve meaning over time.
Let's see if I can precommit to not posting here anymore.
You know the drill - If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
And, while this is an accidental exception, future open threads should start on Mondays until further notice.