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| Date: | 1100-1200 |
| Origin: | un- 'unto, until' + till |
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un‧til S1 W1
1 if something happens until a particular time, it continues and then stops at that time : 
The ticket is valid until March.He waited until she had finished speaking. Until recently, Anna worked as a teacher in Japan.
The ticket is valid until March.He waited until she had finished speaking.Until recently, Anna worked as a teacher in Japan.2 used to emphasize that something does not happen before a certain point in time or before something else has happened : 'Can I go out and play now?' 'Not until you've done your homework.' It was not until 1972 that the war finally came to an end.
not until
'Can I go out and play now?' 'Not until you've done your homework.'It was not until 1972 that the war finally came to an end.