[sig-nuh-tawr-ee, -tohr-ee]
having signed, or joined in signing, a document: the signatory powers to a treaty.
noun, plural signatories.
a signer, or one of the signers, of a document: France and Holland were among the signatories of the treaty.

1640–50, in earlier sense “used in affixing seals”; 1860–65 for def 2; < Latin signātōrius of, belonging to sealing, equivalent to signā(re) to mark, seal (see sign) + -tōrius -tory1

nonsignatory, adjective, noun, plural nonsignatories. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
signatory (ˈsɪɡnətərɪ, -trɪ)
n , pl -ries
1.  a person who has signed a document such as a treaty or contract or an organization, state, etc, on whose behalf such a document has been signed
2.  having signed a document, treaty, etc
[C17: from Latin signātōrius concerning sealing, from signāre to seal, from signum a mark]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1647, "used in sealing" (adj.), from L. signatorius "of sealing," from signatus, pp. of signare "to sign" (see sign). Noun sense of "one who signs" first recorded 1866.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Simply put, it would require signatory countries to agree to enforce legal
  judgments handed down in other countries.
Simply put, it would require the signatory countries to agree to enforce legal
  judgments handed down in other countries.
Its goods might be barred by a signatory to the convention.
Companies from signatory nations are committed to capping their greenhouse-gas
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