Meaning of “cosignatory” in the English Dictionary

"cosignatory" in Business English

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cosignatorynoun [ C ]

uk /ˌkəʊˈsɪɡnətəri/ us /ˌkəʊˈsɪɡnətɔri/ also co-signatory

one of two or more people, countries or organizations who sign an official agreement or document:

He is a cosignatory to a letter, published in the Financial Times.
Canada is a co-signatory of the North American Free Trade Agreement.

a person or organization that signs a document already signed by another person, agreeing to pay that person’s debt if they fail to do so:

British students in the US need a local co-signatory to apply for a loan.

one of two or more people or organizations who take equal responsibility for a financial arrangement:

When one of the co-signatories dies, all of the assets in the joint bank account will continue to be available to their partner.
As a co-signatory to the mortgage, she is considered a joint investor in the fund.

(Definition of “cosignatory” from the Cambridge Business English Dictionary © Cambridge University Press)