ETYM Old Eng. apostle, apostel, postle, AS. apostol, Latin apostolus, from Greek apo from + stellein to send.
An ardent early supporter of a cause or reform.

ETYM Old Eng. disciple, deciple, Old Fren. disciple, from Latin discipulus, from discere to learn (akin to docere to teach; see Docile) + prob. a root meaning to turn or drive, as in Latin pellere to drive (see Pulse).
Someone who believes and helps to spread the doctrine of another; SYN. adherent.
Follower, especially of a religious leader. The word is used in the Bible for the early followers of Jesus. The 12 disciples closest to him are known as the apostles.

ETYM Latin emissarius, from emittere, emissum, to send out: cf. French émissaire. Related to Emit.
Someone sent on a mission to represent the interests of someone else; SYN. envoy.

The position of apostle.

ETYM Latin apostolatus, from apostolus. Related to Apostle.
1. The dignity, office, or mission, of an apostle; apostleship.
2. The dignity or office of the pope, as the holder of the apostolic see.

ETYM Latin apostolicus, Greek: cf. French apostolique.
Of or relating to or deriving from the Apostles or their teachings; SYN. apostolical.
Pertaining to apostle. apostolic fathers, immediate disciples of the apostles, especially those leaving writings. apostolic succession, unbroken derivation of episcopal power from the apostles.

Apostolic.

In an apostolic manner.

The position of apostle.

ETYM Latin apostolatus, from apostolus. Related to Apostle.
1. The dignity, office, or mission, of an apostle; apostleship.
2. The dignity or office of the pope, as the holder of the apostolic see.

The position of disciple.