1a formal 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:we offer a 10-year guarantee against rustingthe treaty provides a guarantee of free trade
something that ensures a particular outcome:a degree is no guarantee of a fast-track career
2 (also guaranty) Law an undertaking to answer for the payment or performance of another person’s debt or obligation in the event of a default by the person primarily responsible for it.
1 [no object] provide a formal assurance, especially that certain conditions will be fulfilled relating to a product, service, or transaction: [with infinitive]:the company guarantees to refund your money
[with object] provide a guarantee for:the cooker is guaranteed for five years (as adjective guaranteed)the guaranteed bonus is not very high
[with object] provide financial security for; underwrite:a demand that £100,000 be deposited to guarantee their costs
2 [with object] promise with certainty:no one can guarantee a profit on stocks and shares
