Mass

What does the word, "Mass" really mean? Does it derive from the same words as "Michaelmas" (which is really what we just celebrated in the view of some) which literally means, Michael-sent?

Christmas means Christ-sent, of course; One can argue that we are celebrating the conception of the One Sent, with Michael being just the bearer of the tidings of great joy; but the actual birth may have taken place in September, around the Feast of Trumpets, which could possibly be more appropriate for such a birth.

(See "The Journey of the Magi"--"I should be glad of another death.")