unless

Listen:
 [ʌnˈlɛs]



WordReference Random House Learner's Dictionary of American English © 2019
un•less /ʌnˈlɛs/USA pronunciation   conj. 
  1. except under the circumstances that:We'll be there at nine, unless the train is late.

WordReference Random House Unabridged Dictionary of American English © 2019
un•less  (un les, ən-),USA pronunciation 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.
  • 1400–50; late Middle English prepositional phrase on less (also o less(e), earlier upon less) on a lesser footing or condition (than); first used as a preposition and conj. in the early 16th century; see on, less


Collins Concise English Dictionary © HarperCollins Publishers::

unless /ʌnˈlɛs/ conj
  1. (subordinating) except under the circumstances that; except on the condition that: they'll sell it unless he hears otherwise
Etymology: 14th Century: onlesse, from on on + lesse less; compare French à moins que, literally: at less than



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