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English definition of “unless”

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unless

conjunction  /ənˌles/ us  
used to say what will or will not happen if something else does not happen or is not true; except if: She won’t go unless you go (= If you do not go, she will not go either, but if you go, she will go). You can’t get a job unless you’ve got the experience (= You can only get a job if you have experience).
(Definition of unless from the Cambridge Academic Content Dictionary © Cambridge University Press)
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