signatory (adj.)youdaoicibaDictYouDict[signatory 词源字典]
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.[signatory etymology, signatory origin, 英语词源]