apostolic UK /ˌæp.əˈstɒl.ɪk/US /ˌæp.əˈstɑːl.ɪk/adjective 4noun 1forms 1 adjective4 •Pertaining to apostles or their practice or teaching; pertaining to the apostles (of early Christianity) or their teachings.I would like to give this dissertation on the apostolic world of thought in early Christian iconography the subtitle of 'In the land of the blessed' —'Μακάρων ἐνἱ χώρῳ'. — 2004 •According to the doctrines of the apostles; delivered or taught by the apostles. •Of or pertaining to the pope or the papacy; papal. •Of or pertaining to the Catholic missions. noun1 •(historical) A member of the Apostolici. formsapostolics