cosignatory
noun[C]
uk/ˌkəʊˈsɪɡnətəri/us/ˌkəʊˈsɪɡnətɔri/(alsoco-signatory)one of two or morepeople,countriesororganizationswhosignanofficialagreementordocument:
He is acosignatory toaletter,publishedin the Financial Times.
Canada is aco-signatory oftheNorthAmerican Free Trade Agreement.
apersonororganizationthatsignsadocumentalreadysignedby anotherperson,agreeingtopaythat person’sdebtif theyfailto do so:
Britishstudentsin the US need alocalco-signatory toapplyfor aloan.
one of two or morepeopleororganizationswho takeequalresponsibilityfor afinancialarrangement:
When one of the co-signatoriesdies, all of theassetsin thejointbankaccountwillcontinueto beavailabletotheirpartner.
As a co-signatory to themortgage, she isconsideredajointinvestorin thefund.