A semicircular projection from a building, especially the rounded east end of a church that contains the altar.
The bishop's seat or throne in ancient churches.
A reliquary, or case in which the relics of saints were kept.
A Christian church building having a nave with a semicircular apse, side aisles, a narthex and a clerestory.
A Roman Catholic church or cathedral with basilican status, an honorific status granted by the pope to recognize its historical, architectural, or sacramental importance.