Definition of until conjunction from the Oxford Advanced Learner's Dictionary

  

until

 conjunction,preposition
conjunction, preposition
BrE BrE//ənˈtɪl//
 
; NAmE NAmE//ənˈtɪl//
 
(informal till, til, ’til)
 
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up to the point in time or the event mentioned Let's wait until the rain stops. Until she spoke I hadn't realized she wasn't English. You're not going out until you've finished this. Until now I have always lived alone. They moved here in 2009. Until then they'd always been in the London area. He continued working up until his death. The street is full of traffic from morning till night. You can stay on the bus until London (= until you reach London). Word Origin Middle English: from Old Norse und ‘as far as’ + till ‘until’ (the sense thus duplicated).
See the Oxford Advanced American Dictionary entry: until