unless
1 ENTRIES FOUND:
Britannica Dictionary definition of UNLESS
— used to say what will happen, be done, or be true if something else does not happen, is not done, or is not true
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He will fail the course unless he gets a 90 on the exam.
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Unless something is done, the species will become extinct.
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I won't have an operation unless surgery is absolutely necessary. [=I will only have an operation if surgery is absolutely necessary]
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“Will I have to pay?” “Not unless [=only if] you want to.”
