U

apostolicity

adjective

of or characteristic of an apostle.
pertaining to or characteristic of the 12 apostles.
derived from the apostles in regular succession.
of or relating to the pope; papal.

adjective

of, relating to, deriving from, or contemporary with the Apostles
of or relating to the teachings or practice of the Apostles
of or relating to the pope regarded as chief successor of the Apostles

adj.

early 15c., from French apostolique or directly from Church Latin apostolicus, from Greek apostolikos, from apostolos (see apostle). Apostolical also is early 15c.