Yes. A dictionary, perhaps, or a literature textbook, or a literary journal, or a widely-cited work of literary criticism, or a publication of an association of authors, or a definition established by a respected university's literature department. Anything along those lines.
As I said, I could give you any number of sources and no two of them would be alike. It's not quantifiable. It's not, "one more fact and this is Science Fiction". It's a personal observation based on your own experiences and choices. Call it what you like.
In other words, you have no authoritative sources for your assertions.
Seriously Sci who cares? You know what he means, what is the big deal? He is using a word differently from how you use it, that has absolutely no bearing on the validity of his argument. It's picking at the presentation instead of the content. I mean, I disagree with most of what DrBashir says usually, but so long as you understand his meaning, why does it matter if it's a different meaning than the way you use it? Unless you're willing to have me take the next post you make and dive into the etymology of every single word you use to guarantee that you're using them as the original usage demands, then just own up to the fact that you're on a crusade of prescriptivist nonsense. You may as well be attacking him for ending sentences with a preposition or something.
DrBashir, I would honestly suggest just dropping it and not responding to this part of his points, dealing only with confrontations with the actual substance of what you're saying. Especially after, like I already said, Christopher pointed out that your usage is not uncommon.