Do we write "seasons greetings" or "season's greetings"?
Thanks for your reply in advance.
I like this explanation:
From Dave's Writing GuideThis is a bizarre idiomatic expression, since one is left with the question, "What season?" I believe it did come from, "The season's greetings to you", the particular season being the winter holiday season, but the expression "season's greetings" is strange in the way that "car's horn" is strange. What you expect is "the season's greetings", or "a season's greetings", or maybe "my season's greetings". Generally when we have a singular common noun in English we expect it to be preceded by an article of some kind. As I've mentioned before, though, expressions take on a life of their own, whether they're grammatical or not.
When you write "season's greetings", remember that it's just one season, and it's that season's greetings, so be sure to put the apostrophe in between the "n" and the "s". I think that it might be the lack of an article that causes us to write "seasons greetings". After all, we can have a plural noun without an article preceding it. In the end, we, as a community of speakers and writers, may come to decide that we don't care about the apostrophe, in which case the apostrophe-less sentence will suffice. For the time being, though, know ye well that "season's greetings" is the way it was meant to be writ, says I. Be ye warned!
Oh, and season's greetings!