Definition of guarantee noun from the Oxford Advanced Learner's Dictionary

        

    guarantee

     noun
    noun
    BrE BrE//ˌɡærənˈtiː//
     
    ; NAmE NAmE//ˌɡærənˈtiː//
     
     
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  1. 1  a firm promise that you will do something or that something will happen synonym assurance to give a guarantee of good behaviour He gave me a guarantee that it would never happen again. They are demanding certain guarantees before they sign the treaty.
  2. 2  a written promise given by a company that something you buy will be replaced or repaired without payment if it goes wrong within a particular period synonym warranty We provide a 5-year guarantee against rust. The watch is still under guarantee. The television comes with a year's guarantee. a money-back guarantee
  3. 3  something that makes something else certain to happen guarantee (of something) Career success is no guarantee of happiness. guarantee (that…) There's no guarantee that she'll come (= she may not come).
  4. 4money or something valuable that you give or promise to a bank, for example, to make sure that you will do what you have promised We had to offer our house as a guarantee when getting the loan.
  5. 5a written promise to pay back money that somebody else owes, or do something that somebody else promised to do, if they cannot do it themselves A close relative, usually a parent, can provide a guarantee for the loan.
  6. Word Origin late 17th cent. (in the sense ‘guarantor’): perhaps from Spanish garante, corresponding to French garant, later influenced by French garantie ‘guaranty’.Extra examples Arriving early is no longer a guarantee of getting a place. Driving into town early is no longer a guarantee of getting a parking space. The car is still under guarantee, so you should be able to get it repaired free of charge. The company offers a full money-back guarantee. The contractors offer a full money-back guarantee on all their work. The country gives a constitutional guarantee of the rights of minorities. The demonstrators were demanding guarantees for fair elections. The garage gives a year’s guarantee for all repair work. The window frames carry a 20-year guarantee against rot or decay. There was no guarantee against misuse of the king’s power. We didn’t get any firm guarantee of a loan. He received a guarantee that the documents would not be published. The union wants cast-iron guarantees that there will be no job losses. They insisted on having a written guarantee of good conduct from her.
See the Oxford Advanced American Dictionary entry: guarantee