›[C or U]COMMERCE a written promise by a company to return a customer's money or repair or change the product if there is a problem within a particular period after buying it: The system costs £99.95 including postage, packing and a 12-month guarantee.I'm afraid we can't replace the television as it's no longer under guarantee.come with/have/carry a guaranteeThe laptop has a two-year guarantee.a guarantee on sthThere is a six-month guarantee on all our vehicle repairs.The store offers money-back guarantees on all electronics.
›[C]something that makes another thing sure to happen or to be true: no guarantee of sth/not a guarantee of sthLaboratory testing of a new drug is not a guarantee of safety.a guarantee thatThere is no guarantee that the discussions will lead to a deal.
›[C]a promise from someone that something will be done or will happen: a guarantee thatThe CEO gave employees a guarantee that he would keep the factory open at all costs.
›[C]BANKINGsomething valuable that you offer to someone with the agreement that they can keep it if you fail to pay a loan or do what you promise: a guarantee against sthThe mortgage borrower provides the house as a guarantee against the loan.