bound·en (boun?d?n)adj.1. Obligatory: their bounden duty.2. Archaic Being under obligation; obliged.[Middle English, past participle of binden, to bind, from Old English bindan; see bind.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.bounden (?ba?nd?n) adjmorally obligatory (archaic except in the phrase bounden duty)Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014bound?en (?ba?n d?n) adj. 1. obligatory; compulsory: one’s bounden duty. 2. Archaic. under obligation; obliged. [1250?1300; Middle English] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.