The word "Christmas" actually comes from the Old English word "Cristes maesse," which means "Christ's mass." The term was first used in 1038 AD in a document called the Anglo-Saxon Chronicle. The name was a combination of the Old English word "crist" meaning Christ, and the word "maesse" meaning mass. Over time, the word "Cristes maesse" evolved into the modern word "Christmas." So, it's safe to say that the word "Christmas" has a very deep and meaningful origin!