The question posed by Maverick...

"...to what extent does our use of language have a fixed and certain meaning?"

...is the most important question of out time.

And I think that our very survival as a vibrant evolutionary force depends on our ability to resolve a functional answer.

The short answer is "NO!" .

But, of course, some meanings can be better "fixed" in meaning than others.

But no meaning of any word, or of any groups of words can have a meaning that is absolute.
Such is the nature of words.

Anyone here who thinks otherwise should turn in their
Tom Corbett Space Cadet Language Decoder Ring and slink off in shame because they know not well of what that they think.