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English definition of “guarantee”

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guarantee

noun uk   /ˌɡær.ənˈtiː/ us  
B2 [C or U] a promise that something will be done or will happen, especially a written promise by a company to repair or change a product that develops a fault within a particular period of time: The system costs £99.95 including postage, packing and a twelve-month guarantee. The TV comes with/has a two-year guarantee. a money-back guarantee [+ that] The United Nations has demanded a guarantee from the army that food convoys will not be attacked. [+ (that)] There is no guarantee (that) the discussions will lead to a deal. A product as good as that is a guarantee of commercial success (= it is certain to be successful). The shop said they would replace the television as it was still under guarantee. [C] a formal agreement to take responsibility for something, such as the payment of someone else's debt [C] something valuable that you give to someone temporarily while you do what you promised to do for them, and that they will keep if you fail to do it
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guarantee

verb [T] uk   /ˌɡær.ənˈtiː/ us  

guarantee verb [T] (PROMISE)

If a product is guaranteed, the company that made it promises to repair or change it if a fault develops within a particular period of time: The fridge is guaranteed for three years.B2 to promise that something will happen or exist: [+ two objects] European Airlines guarantees its customers top-quality service. The label on this bread says it is guaranteed free of/from preservatives (= it contains no preservatives). If you guarantee someone's debt, you formally promise to accept the responsibility for that debt if the person fails to pay it.
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guarantee verb [T] (MAKE CERTAIN)

If something guarantees something else, it makes certain that it will happen: [+ (that)] The £50 deposit guarantees (that) people return the boats after their hour has finished. If something is guaranteed to happen or have a particular result, it is certain that it will happen or have that result: [+ to infinitive] Just looking at a picture of the sea is guaranteed to make me feel sick.
(Definition of guarantee from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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