a written authorization or order to pay a specified sum of money to a specified person.
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British Dictionary definitions for bill of exchange
(now chiefly in foreign transactions) a document, usually negotiable, containing an instruction to a third party to pay a stated sum of money at a designated future date or on demand
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012