Русско-англо-русский юридический словарь

acceptance of a bill of exchange. Process by which a buyer (called a 'drawee') accepts the seller's bill of exchange by signing under the words 'accepted' on face of the bill. By this act, the drawee becomes the acceptor and converts the bill into a post-dated check an unconditional obligation to pay it on or before its maturity date. (BusinessDictionary)

An unconditional obligation, one which is to be performed without depending upon any event provided by the parties to it. (Termium)