sig ‧ na ‧ to ‧ ry /ˈsɪɡnət ə ri $ -tɔːri/ BrE AmE noun ( plural signatories ) [countable]
[ Word Family: noun : ↑ sign , ↑ signal , ↑ signatory , ↑ signature , ↑ signing , ↑ signaller ; verb : ↑ sign , ↑ signal ; adverb : ↑ signally ; adjective : signed ≠ ↑ unsigned ]
one of the people, organizations, or countries that signs an official agreement
signatory to/of
The UK is a signatory to the Berne Convention.
the signatories of the Helsinki Declaration