- a governor of an outlying province in the ancient Byzantine Empire
- the supreme head of the independent Orthodox Church of Bulgaria
- Eastern Orthodox Ch.
- Historical an archbishop or patriarch
- now, a bishop or other member of the clergy serving as a patriarch's deputy or legate
Origin of exarchLate Latin exarchus, overseer of monasteries from Classical Greek exarchos, leader, chief (in LGr, prefect, bishop): see ex- and -arch