<p><strong>Noun</strong></p><ul><li>Cosignatory.</li><li>Finance: A joint signer of a negotiable instrument, especially a promissory note, who promises to repay the loan amount if the primary borrower cannot.</li><li>Finance, Banking: An additional signer on a checking or savings account who acts as a guarantor jointly responsible for overdraft and other fees, but who cannot deposit or withdraw money from the account.</li></ul>