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tr.v. co·signed, co·sign·ing, co·signs
1. To sign (a document) jointly.
2. To endorse (another's signature), as for a loan.
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.
(Law) a cosignatory
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
co•sign•er(ˈkoʊˌsaɪ nər, koʊˈsaɪ-)
1. a cosignatory.
2. a joint signer of a negotiable instrument, esp. a promissory note.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||cosigner - one of two or more signers of the same document (as a treaty or declaration)|
|2.||cosigner - a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety)|
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