Date: 2004-12-20 06:23 pm (UTC)
I don't know if it's in dictionaries

It's in the OED. The first usage in the sense of "up to the time of (an event)" was eight hundred and fifty years ago, marginally predating 'until'.

http://dictionary.oed.com/cgi/entry/50252760?query_type=word&queryword=till&first=1&max_to_show=10&sort_type=alpha&search_id=KlGI-iR9nMh-4457&result_place=3 Unfortunately, you won't be able to read the link until you're back at college, pay for a subscription, or set up an http tunnel.

Unfortunately, I'm not very good at reading complicated dictionary entries, so I'm not sure when they're synonymous and when not, and have probably misrepresented it a bit. But it's good for getting a discussion going :)
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