cosigner

[koh-sahy-ner, koh-sahy-]
noun
1.
a cosignatory.
2.
a joint signer of a negotiable instrument, especially a promissory note.

Origin:
1900–05; co- + signer

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
cosigner

noun
1. one of two or more signers of the same document (as a treaty or declaration) 
2. a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety) 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
One important thing is that while you are searching for a education loan you
  may find that you will need a cosigner.
Prohibits a bank from misrepresenting the nature and extent of a cosigner's
  liability.
The cosigner notice should be in the same language as the agreement to which it
  applies.
In some instances, a cosigner may be needed to obtain a student loan.
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