Eh, I guess they mean as much as you want them to mean. I don't pay attention to meters (unless I'm calibrating equipment -- Though I do leave a meter engaged here and there while working just to make sure everything is "within spec" for lack of a better term).
When the Avocet (monitoring controller) is set at it's "home" position, that's what I care about. How loud it is at that spot. What the number is doesn't matter.