Definify.com

Webster 1913 Edition

Noun.

[Gr. [GREEK];

ἐπί

over + [GREEK] chief, [GREEK] supreme power, dominion.]

In ancient Greece, the governor or perfect of a province; in modern Greece, the ruler of an eparchy.

Noun.

[Gr. dominion.] The governor or prefect of a province.

eparch ‎(plural eparchs)

(historical, Ancient Greece) The governor or prefect of a province.
The ruler of an eparchy.
(Eastern Orthodoxy) The metropolitan bishop of a province or eparchy.
- 2011, Norman Davies, Vanished Kingdoms, Penguin 2012, p. 246:
  An Orthodox eparch, or metropolitan bishop, was installed in Polatsk in 992.