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English word apostolic comes from Ancient Greek ἀποστολικός, and later Latin apostolicus (Of or pertaining to an apostle; apostolic.)
ἀποστολικός (Ancient Greek)
apostolicus (Latin)
Of or pertaining to an apostle; apostolic.
apostolic (English)
Of or relating to the pope or the papacy; papal.. According to the doctrines of the apostles; delivered or taught by the apostles. Pertaining to an apostle, or to the apostles, their times, or their peculiar spirit.