Definition of till conjunction from the Oxford Advanced American Dictionary

  

till

 conjunction,preposition
conjunction, preposition
NAmE//tɪl//
 
= until
 
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We're open till 6 o'clock. Can't you wait till we get home? Just wait till you see it. It's great. Till is generally felt to be more informal than until and is used much less often in writing. At the beginning of a sentence, until is usually used.
See the Oxford Advanced Learner's Dictionary entry: till