A signatory is someone who signs a document and is subject to it. The co-signer for a loan is one type of signatory.

A signatory is someone who signs a contract, therefore creating a legal obligation. There could be several signatories for a specific contract. Over time, this word has often been used for a person or country who signs a peace treaty. If the treaty is broken, the signatory will be blamed. You could be a signatory for a marriage, mortgage, adoption, lawsuit, or employment contract.

Definitions of signatory

n someone who signs and is bound by a document

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cosignatory, cosigner
one of two or more signers of the same document (as a treaty or declaration)
a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety)
a signer of a 1679 address to Charles II in which those who petitioned for the reconvening of parliament were condemned and abhorred
endorser, indorser
a person who transfers his ownership interest in something by signing a check or negotiable security
attestant, attestator, attestor, witness
(law) a person who attests to the genuineness of a document or signature by adding their own signature
accommodation endorser
a person who endorses a promissory note without compensation or benefit but simply as a favor to the borrower
Type of:
individual, mortal, person, somebody, someone, soul
a human being

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