noun \ˈkō-ˌsī-nər\

: a person who signs an official document (such as a loan, contract, or law) with another person : a person who cosigns something

Full Definition of COSIGNER

:  cosignatory; especially :  a joint signer of a promissory note
co·sign \ˈkō-ˌsīn\ verb

Examples of COSIGNER

  1. Both senators are cosigners of the bill.
  2. My mother agreed to be a cosigner on my car loan.

First Known Use of COSIGNER

circa 1903


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