Cathedral

A cathedral is a large, important church that is the main church of a district and is led by a bishop. It is often big, old, and richly decorated.

From Old French 'cathedrale', from Medieval Latin 'cathedrālis (ecclēsia)' meaning 'church of the bishop’s seat', from Greek 'kathedra' meaning 'seat' or 'chair'. The focus was originally on the bishop’s official chair, not the size of the building.