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Until

/ʌnˈtɪl/

Indicates something will happen or continue up to a certain time or event

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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 Norse und, meaning as far as, and til, meaning to, used with the sense of continual progress towards a limit or point in time

321 mentions per 1 million words

Very Often

Hint: Frequency according to COCA