Soulboy said:
As per the Oxford English Dictionary...
Till - a less formal way of saying until.
Trust me mate, I had a lengthy argument going on with someone about this ( I actually spelled it "'til" and was told it was wrong!)... but it was finally agreed that either way was acceptable.
Unless someone knows different...?
Hmm.
I'd argue that 'Till' is a noun, and also its lack of an apostrophe denotes that it's not been shortened, per se.
However, the Oxford is pretty accurate, so maybe I'll admit defeat! I'll still use "'til", though!