Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Signed jointly.
  • noun One who cosigns.

from The Century Dictionary.

  • Uniting with another or others in signing, as a treaty or agreement: as, cosignatory powers.
  • noun One who unites with another or others in signing a treaty or agreement.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective signed or signing jointly
  • noun Any of several people who sign a document together (especially a treaty)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective signing jointly with others
  • noun one of two or more signers of the same document (as a treaty or declaration)

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

cosign +‎ -atory

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