mirror-image ruleContracts. The doctrine that the acceptance of a contractual offer must be positive, unconditional, unequivocal, and unambiguous, and must not change, add to, or qualify the terms of the offer; the common-law principle that for a contract to be formed, the terms of an acceptance must correspond exactly with those of the offer.
? In modern commercial contexts, the mirror-image rule has been replaced by a UCC provision that allows parties to enforce their agreement despite minor discrepancies between the offer and the acceptance. The rule still applies to international sales contracts governed by the UN Convention on Contracts for the International Sales of Goods (article 19).
¡ª Also termed ribbon-matching rule. See BATTLE OF THE FORMS. [Cases: Contracts 24. C.J.S. Contracts ¡ì¡ì 52¨C53.]