Etymology
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cosigner (n.)

also co-signer, "one who unites with another or others in signing a treaty, etc.," 1946, agent noun from cosign. Earlier in this sense was cosignatory (1851).

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Definitions of cosigner

cosigner (n.)
one of two or more signers of the same document (as a treaty or declaration);
Synonyms: cosignatory
cosigner (n.)
a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety);
From wordnet.princeton.edu