Acceptance in contract law is when a person agrees to the terms of an offer without any changes. The formation of a valid contract is ultimately dependent on the offeracceptance paradigm, which is a series of backandforth manifestations of intent.An offer is a promise to do or refrain from doing something in the future conditioned on the other party's acceptance. Agreement to the terms of an offer- once acceptance is made the contract exists. - Offer cannot be withdrawn after acceptance. Chapter 4 Contract: Offer and acceptance. Introduction (P158). O if a purported acceptance varied from an offer in any respect, then no contract was formed. Acceptance must correspond with the offer and be unequivocal. 30 It must take the form of an external act and be communicated to the offeror.