I'm reading about category theory. A question I don't see answered anywhere is about the choice of the word "category" in this context. Why this concept was named "category"?
The term ``category'' came from the Kantian perspective on a category being the most general form of thinking, although I may be mistaken on the finer points of the actual philosophy there. This is discussed in this philosophy.stackexchange post here (see the accepted answer in particular) which speaks far more eloquently on the subject than I could hope to mimic.