noun / adjective
signatory
SIG-nuh-tor-ee/ˈsɪɡnətɔːri/
A party that has signed or formally joined an agreement.
Each signatory agrees to follow the terms of the treaty.

Etymology
The word first described something used in sealing. Its noun sense identifies a party whose signature binds it to an agreement, connecting the older act of marking or sealing with formal commitment.
In context
like Malaysia that is not a signatory to the UN Convention on Refugees or its protocol?
If we're not a signatory to the treaty, we're not at the table.
More examples
- The signatories meet annually to review the agreement.
- Our company is a signatory to the industry safety agreement.
- Signatory countries agree to reduce pollution within their borders.
Forms
signatory · signatories
signature noun — A person's name written by that person.
Similar words
- signer
- Someone who signs any document, not necessarily an agreement.
- party
- Someone involved in an agreement, with or without a signature.