D defs.my
Entry 2 senses Webster, 1913

Apostolate

· A·pos·to·late · IPA
01 n. The dignity, office, or mission, of an apostle; apostleship.
  1. 1.
    The dignity, office, or mission, of an apostle; apostleship.
    “Judas had miscarried and lost his apostolate.” Jer. Taylor.
  2. 2.
    The dignity or office of the pope, as the holder of the apostolic see.