until

 
Pronunciation: /ənˈtɪl/

preposition & conjunction

  • up to (the point in time or the event mentioned): [as preposition]: the kidnappers have given us until October 11th to deliver the documents he held the office until his death [as conjunction]: you don’t know what you can achieve until you try

Origin:

Middle English: from Old Norse und 'as far as' + till1 (the sense thus duplicated)

On the differences between until and till, see till1 (usage).