Definition : a usu. implied warranty that the property being sold is merchantable (as by being of a quality that is generally acceptable in that line of trade) Under the U.C.C., a warranty of merchantability is not implied unless the seller is a merchant with respect to the goods sold. b: a usu. written guarantee of the integrity of a consumer product and of the maker's responsibility for the repair or replacement of defective parts see also Consumer Product Safety Act in the Important Laws section 3: a statement made in an insurance policy by the insured that a fact relating to the subject of the insurance or the risk exists or will exist or that some related act has been done or will be done compare representation A warranty in an insurance policy must be true or be fulfilled in order for the policy to be valid.