noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A cosignatory
2. 2
   one of two or more signers of the same document (as a treaty or declaration) wordnet
3. 3
   A person who accepts joint responsibility for the debt of another
4. 4
   a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety) wordnet

Synonyms

All synonyms

cosignatoryendorserguarantorinsurernotaryparty

Etymology

From co- + signer or cosign + -er.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.