What's the difference between till and until?I know both of them can be used as prep. and conj..

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Till is less formal then until. So, in writing, I'd use 'until'.

Looking at some of the other answers; there seems to be some confusion.
'Till' is not short for 'until'. It is a word in its own right, which means the same as 'until'. Till is perfectly correct.

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proper and improper

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‘til is short for "until".

so "until" is the correct word, 'til 是一個口語的縮約， 不正式的

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http://learnwordlist.com/blog/difference-between-untiltill-and-up-to/2010/10/gre-word-list-test-blog-barrons-vocabulary

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