Both till and until mean โup to a certain point in timeโ:
- Donโt worry, we wonโt start without you. Weโll wait until/till you arrive.
- They donโt open until/till nine.
The main difference between the two words is that till is only used in informal style. So, in formal contexts, make sure to use until.
Till may also be spelt as โtil. This form is most common in American English.
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