arch-
From Middle English arch-, arche-, from Old English arċe-, ærċe-, erċe- (“arch-”), from Latin archi- (reborrowed directly as Modern English archi-), from Ancient Greek ἀρχι- (arkhi-), from ἄρχω (árkhō, “to begin, to lead, to rule, to govern”) (whence also English -arch), from Proto-Indo-European *arkhein (“to begin, rule, command”).