Simply put, an "offer" is a proposal from one party to another intending to create a legal obligation upon acceptance. Quick Answer on Acceptance in Contract Law: Acceptance in contract law is when a person agrees to the terms of an offer without any changes."Acceptance" may reasonably be implied from words or conduct, and it must occur before the offer is withdrawn or lapses. Refers to the Pima County Community College District, a political subdivision of the State of Arizona. 2. SCOPE. "Bidder" means a person who desires to make a proposal on procurement. (See "Qualified Bidder" and "Responsive Bidder"). 2. Acceptance is a critical concept in contract law. Agreeing to an offer forms a legally binding agreement between the two parties.