Historic churches with a hierarchical form of governance (bishop, priest, deacon) who place importance on a succession of bishops traceable to early times (called apostolic succession). Examples include Roman, Orthodox, Anglican and some Lutheran churches.
1. of or belonging to an ambassador; ambassadorial. 2. of, belonging to, founded by, or descended from the Christian Apostles in direct line of succession; hence, 3. (Roman Catholic) of the Bishop of Rome; of the Pope; papal.