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
  1. noun
    someone who signs and is bound by a document
    synonyms: signer
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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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