Following this line of thought, it's also incorrect to talk about a 'renaissance' (rebirth) period since there's clearly nothing new about it now.
Specialized bodies of knowledge have their own terms. I don't expect the terms that theoretical physicists use to be immediately accessible to me or the rest of the uninitiated general public, but for whatever reason most any given layperson seems to have the expectation that they can pick up a text on 20th century French literary theory and immediately understand it (and if they don't, then it's the author's fault, the entire field is ridiculous and meaningless, or there's some other similarly hubristic conclusion).
As for the 'well-established meaning' bit, it's more than questionable to say that the general public is an authority on technical language. Neither I nor most of the people you'll run into on the street probably know much about the terminology air traffic controllers or chemical engineers regularly use on the job with their peers, but that has absolutely nothing to do with whether or not there's an established meaning within the contexts in which their terms see use.