Etymology
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signatory (adj.)

1640s, "used in sealing," from Latin signatorius "of sealing," from signatus, past participle of signare "to sign" (see sign (v.)). Noun sense of "one who signs" (a treaty, etc.) first recorded 1866.

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Definitions of signatory

signatory (n.)
someone who signs and is bound by a document;
Synonyms: signer
From wordnet.princeton.edu