until
1 prep If something happens until a particular time, it happens during the period before that time and stops at that time.
PREP n/prep
(=till)
Until 1971, he was a high-ranking official in the Central Communist Committee., ...consumers who have waited until after the Christmas holiday to do that holiday shopping.
Until is also a conjunction., conj
(=till)
I waited until it got dark..., Stir with a metal spoon until the sugar has dissolved.
2 prep You use until with a negative to emphasize the moment in time after which the rest of your statement becomes true, or the condition which would make it true.
PREP after neg
(=till)
The traffic laws don't take effect until the end of the year..., It was not until 1911 that the first of the vitamins was identified.
Until is also a conjunction., conj CONJ after neg
(=till)
The EU will not lift its sanctions until that country makes political changes.
Translation English - Cobuild Collins Dictionary  

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"