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Meaning of unless

un•less

Pronunciation: (un-les', un-), [key]
— conj.
  1. except under the circumstances that: I'll be there at nine, unless the train is late.
—prep.
  1. except; but; save: Nothing will come of it, unless disaster.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.