So was having a chat this evening with a friend and for some odd reason this came up.  We kept trying to determine what would come after thrice.  You say, at least have heard at some point in time in our lives  -  once, twice, thrice.  So we all make the assumption that it means 'three times'.  So is there something after thrice?  Doing some research, it appears, nothing ever came to continue down the path. 

Now the question is, would anyone actually ever use thrice in a sentence. Would you ever come up to someone and say ' are you still working out thrice a week?'  ?  Does it really fit into any real usage.  Can't really say so.  Where does the word come from even?  What was the intention?

 The best I could find were some references in Shakespeare, The King James Bible and some writing about the Roman times.  There was this band named 'thrice' also.  Which all i kept seeing in search engines were for their lyrics. Was a bit annoying when I was looking for something a bit more in depth.

maybe i'll keep digging. What else do I have to do. :)