Русско-англо-русский юридический словарь

bill of exchange A written, unconditional order by one party (the drawer) to another (the drawee) to pay a certain sum, either immediately (a sight bill) or on a fixed date (a term bill), for payment of goods and/or services received. (BusinessDictionary.com)

promissory note Written, signed, unconditional, and unsecured promise by one party (the maker or promisor) to another (the payee or promisee) that commits the maker to pay a specified sum on demand, or on a fixed or a determinable date. (BusinessDictionary.com)

An acceptance is one person's compliance with the terms of an offer made by another person or it is the unconditional consent to the terms of the offer. To make a binding contract the acceptance must exactly match the offer. The offeree must accept all the terms of the offer. However, in certain cases it is possible to have a binding contract without a matching offer and acceptance. (lawteacher.net)

Gentlemen–I hereby give my full and unconditional consent to the terms of the Mortgage proposed by & on the part of Lord Blessington and request that you will without further delay complete the same. ("Between Two Worlds" by George Gordon Byron Baron Byron, Leslie Alexis Marchand)