An opportunity to reject a binding contract at will by a third party is said to be a?

An opportunity to reject a binding contract at will by a third party is said to be a "voidable contract". A voidable contract is a legal agreement between two parties that may be rendered unenforceable by one of the parties. The right to void a contract usually rests with one of the parties, but in some cases, a third party may have the power to void the contract. This third party could be someone who is not yet born, someone who is not yet identified, or someone who has the power to reject the contract for some other reason.