Webster's Revised Unabridged Dictionary · 1913

Signatory

Signatory , adjective

[Latin signatorius.]

1.
Relating to a seal; used in sealing. [Obsolete] — Bailey
2.
Signing; joining or sharing in a signature; as, signatory powers.

Signatory ({not transcribed}) , noun

A signer; one who signs or subscribes; as, a conference of signatories.