Look up apostolic in Wiktionary, the free dictionary.
Apostolic or Apostoilc (Greek Ἀποστολικὴν) is the fourth mark of the Church, the others being "One", "Holy" and "Catholic", contained in the Nicene Creed, which is an exposition of faith accepted by most self-identifying Christian Churches and communions (see Nicene Christianity).
Apostolic may refer to; An Apostle meaning one sent on a mission
The Apostolic See: in Roman Catholic usage, the "the Apostolic See" is used in the singular and capitalized to refer to the See of Rome, with reference to the Pope of Rome's status as the person believed to be the direct successor of the Apostle Peter. (See also Papal supremacy).
Apostolic Pastoral Congress, an organization consisting of Pentecostal bishops, pastors and other clergy, functioning as a collegiate collective, and founded during the first decade of the 21st century.
An Apostolic see is any episcopal see whose foundation is attributed to one or more of the Apostles. (For the Roman Catholic usage, when capitalized and used with the definite article, see above).