What does the word Until mean?

Usage examples for Until

  1. Please don't let your mother go to bed until you have heard from one or the other of us. – The Grafters by Francis Lynde
  2. She might say that nothing could be done until Cosimo came back- or that when Cosimo came back would be too late to do anything. – A Crooked Mile by Oliver Onions
  3. I should be able to work until then. – O+F by John Moncure Wetterau