|Origin:||un- 'unto, until' + till|
un‧til S1 W1
if something happens until a particular time, it continues and then stops at that time: ! Until and till have the same meaning. Till is more usual in spoken English, and is not used in formal writing: Tom waited until he saw the flag. | I'll sit here till you get back.
The ticket is valid until March.
He waited until she had finished speaking.
Until recently, Anna worked as a teacher in Japan.
Up until last year, they didn't even own a car.
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.