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English definition of “guarantee”

guarantee

noun [C/U]    /ˌɡær·ənˈti, ˈɡær·ənˌti/
a promise that something will be done or will happen, esp. a written promise by a company to repair or change a product that develops a fault within a particular period of time: [C] The vacuum cleaner comes with a two-year guarantee. Guarantee is also the state of being certain of a particular result: [U] No matter how many stars you have in the show, there’s no guarantee (= it is not certain that) it will be a success.
(Definition of guarantee noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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