In contract law, a proposal made in response to an original offer modifying its terms, but which has the legal effect of rejecting it.
A counteroffer normally terminates the original offer, but the original offer remains open for acceptance if the counteroffer expressly provides that the counteroffer shall not constitute a rejection of the offer.
The uniform commercial code (UCC)—a body of law adopted by the states that governs commercial transactions—modifies this principle of contract law with respect to the sale of goods by providing that the "additional terms are to be construed as proposals for addition to the contract."
"Counteroffer." West's Encyclopedia of American Law. . Encyclopedia.com. (November 17, 2018). https://www.encyclopedia.com/law/encyclopedias-almanacs-transcripts-and-maps/counteroffer
"Counteroffer." West's Encyclopedia of American Law. . Retrieved November 17, 2018 from Encyclopedia.com: https://www.encyclopedia.com/law/encyclopedias-almanacs-transcripts-and-maps/counteroffer