-alis is something like "pertaining to" I believe, though I'm not entirely certain.
Also, I like Io Saturnalia as Latin for Merry Christmas; it's pagan yes, but it gets the idea across in a more Roman way than my suggestion, i.e. Gaude(te) Nativitate.
Also, I like Io Saturnalia as Latin for Merry Christmas; it's pagan yes, but it gets the idea across in a more Roman way than my suggestion, i.e. Gaude(te) Nativitate.