eparchEtymologyFrom Ancient Greek ἔπαρχος (éparkhos), from ἐπί (epí, “over”) + ἀρχός (arkhós, “ruler”).eparch means the governor or prefect of a province. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounThe governor or prefect of a province.The ruler of an eparchy.The metropolitan bishop of a province or eparchy.“An Orthodox eparch, or metropolitan bishop, was installed in Polatsk in 992.”