communicatory

adj

1. Of, relating to, or suitable for communication.
2. (historical, rare)Chiefly in communicatory letters (or letters communicatory): of or relating to communion.

   “Thirdly, before there was one ſupreme or vniuerſall Biſhop, there was vnitie and communion betweene all the Biſhops in Chriſtendome, whoſe courſe to preſerue vnitie in che Churches and to auoid Schiſme, was to communicate che confeſſions of their faith one with an other by their communicatorie, pacificall or formed letters.”

   “It is true, in the Primitive Churches there were ſundry prudential acts of Communion paſs’d between them, ſuch as their formed and communicatory Letters, by which the holy Biſhops gave an account to each other of the ſtate and condition of their reſpective Churches, and conſulted each others judgment about them; […]”

   “Rufinus, however, obtained communicatory letters of pope Siricius, and with them went to Aquileia.”

   “External communion, on the other hand, consists in the same Creeds, Sacraments, Liturgical forms, rites, and ceremonies, communicatory letters between Churches, and the same discipline and episcopal government.”