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cosigner

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

First recorded in 1900–05; co- + signer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for cosigner

n.

also co-signer, 1946, agent noun from cosign; earlier in this sense was cosignatory (1865).

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Online Etymology Dictionary, © 2010 Douglas Harper