And for something as trivial as a two-letter acronym, does the first appearance in print cement it for all time? Does it constrain conventional usage forever? I'd check out some other acronyms to get an idea of their various usages and meanings over time. There's a site for that.
In the context of "originally meant" (your words), yes, the original meaning of a word is going to be its meaning when the word first came into usage. Sure, word meaning can change over time, but their original meaning shouldn't.
