TYPO3 Core

The word depreciated actually is a word, and means something similar.

However, you are right in that "deprecated" is in fact the better word for it.

I can confirm that this spelling mistake has made it into many many files. Perhaps a global search/replace will do?

both words seems to be quite common, deprecated being maybe the better one, dont know.
I don't think it is a bug. ;)

The "correct" word is "deprecated", but the dictionary says that "depreciated" is being used often in the sense of "deprecated". This is a recent trend.

ok, thanks masi, I think I can close the bug now.
It's time to hunt real bugs instead ;-)