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Until

/ʌnˈtɪl/

Indicates a point in time at which something ends or changes

Synonyms:

This word has no antonyms

So I'm staying right here until a doctor comes.'

Until that day in the library...

After supper we talked until almost eleven.

from Old English untill a combination of un- (as far as) and till (to), meaning up to the time of.

321 mentions per 1 million words

Very Often

Hint: Frequency according to COCA