I often ask these "stupid" questions, though. I usually start with: "it might have been said in other meetings, but just to be sure, what is...", "I might be a bit slow, could you explain X once again just to make sure I understand it", "So just to paraphrase what we've been discussing, X is Y, is that correct?", and sometimes I just ask "what does $acronym stand for and why is it important for us now".
I, too, often find that nobody knows the answers to very basic questions and we are in a meeting of 6-12 people...