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Old 08-31-2009, 09:54 PM is offline
Join Date: Mar 2003
Location: Minneapolis, MN
Posts: 13,777
Such words move in a progression from:
- 2 separate words
- 2 words hyphenated
- 1 conjoined word.

There's usually a long period where they are changing. Which form is 'correct' depends on the context, the formality of the writing, and the age of the writer, among other things.

If you look at books from the 1700's and 1800's, you will see "to-day" and "to-morrow" frequently. Those terms were in the second stage of that progression at the time. But most modern readers don't even realize that these terms started out as 2 separate words.