Definition of guarantee in English:

guarantee

Syllabification: guar·an·tee
Pronunciation: /ˌgarənˈtē
 
/

noun

1A formal promise or assurance (typically in writing) that certain conditions will be fulfilled, especially that a product will be repaired or replaced if not of a specified quality and durability: we offer a 10-year guarantee against rusting
More example sentences
  • The Government is guaranteeing that people who purchase water will now have a guarantee of repairs and spare parts.
  • The formal guarantee of women's rights was absent from the initial draft but the refusal of Afghan women to be silenced ensured its inclusion in the final version.
  • I might actually be willing to pay the normal retail price to buy or rent DVDs, if in exchange I get a guarantee of quality and a decent selection.
Synonyms
1.1Something that gives a certainty of outcome: past performance is no guarantee of future results
More example sentences
  • There is, of course, no guarantee of a successful outcome in this endeavor until your application is thoroughly reviewed at numerous FAA levels.
  • He recalled that multiparity and previous easy deliveries are no guarantee of a similar outcome.
  • Just keep in mind that you will be undertaking a science experiment with no guarantee of the outcome!
2 (also guaranty) Law A formal pledge to pay another person’s debt or to perform another person’s obligation in the case of default.
2.1A thing serving as security for a formal pledge to pay another person’s debt.
2.2 less common term for guarantor.

verb (guarantees, guaranteeing, guaranteed)

[no object] Back to top  
1Provide a formal assurance or promise, especially that certain conditions shall be fulfilled relating to a product, service, or transaction: [with clause or infinitive]: the con artist guarantees that the dirt pile will yield at least 20 ounces of gold
More example sentences
  • The only thing that it guarantees with its product is that your car will meet these New Jersey standards.
  • Irrespective of market performance, the product guarantees 100 per cent of your money back at the end of five years.
  • Some manufacturers have been willing to guarantee that their products are latex free, and others seem less than eager to supply information about their products.
1.1 [with object] Provide a formal assurance regarding (something, especially a product): the repairs will be guaranteed for three years (as adjective guaranteed) the guaranteed bonus is not very high
More example sentences
  • My new entertainment system is guaranteed for five years.
  • Make sure you are fully aware of what part of the product is being guaranteed too.
1.2 [with object] Provide financial security for; underwrite: a demand that $100,000 be deposited to guarantee their costs
More example sentences
  • For most agents to approve a rookie contract, option bonuses must be fully guaranteed.
Synonyms
underwrite, put up collateral for
1.3 [with object] Promise with certainty: no one can guarantee a profit on stocks
More example sentences
  • The concept would certainly promote stability and guarantee a return to profits in the short term but also on the longer run.
  • But if you want to ensure Cupid's bow really hits the mark, innovative tour operators and hoteliers have come up with some creative ideas they promise will guarantee you true romance home or away.
  • Fourth, the president must take immediate, urgent, essential steps to guarantee the promised elections can be held next year.
Synonyms
promise, swear, swear to the fact, pledge, vow, undertake, give one's word, give an assurance, give an undertaking, take an oath

Origin

late 17th century (in the sense 'guarantor'): perhaps from Spanish garante, corresponding to French garant (see warrant), later influenced by French garantie 'guaranty'.

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