relating to the Apostles (= the group of early Christians who travelled to different places telling people about Jesus Christ)

The once united apostolic church splintered over issues of power, governance, and doctrine. 曾经团结的使徒教会因权力、治理和教义问题而分裂。

These people had a deeply apostolic and missionary spirit. 这些人具有深厚的使徒情操和传教精神。

relating to the authority of the Pope (= the leader of the Roman Catholic Church), especially when this is seen as coming from St. Peter or the Apostles

an apostolic letter 一封使徒书信

The apostolic nuncio is the Pope's ambassador. 圣座大使是教皇的使节。

The cardinal was appointed an apostolic administrator. 红衣主教被任命为使徒行政官。