dominus

The word dominus is a direct borrowing from Latin, where it functioned as the primary term for "master" or "owner." It is built upon the root dom-, meaning "house," which derives from the Proto-Indo-European root dem-, also signifying "house" or "household." This etymological path reveals the core logic: the master was fundamentally the head of the household, the one who owned and ruled the domestic sphere. Over time, its application expanded from the domestic realm to denote secular and religious authority, such as feudal lords and references to God, before giving rise to a vast family of English derivatives like dominate, dominion, and domain.

Structure: domin (lord, master) + us (masculine nominative singular suffix) - domin: From Latin dominus meaning "master, owner, lord." Its root is dom- (house), from Proto-Indo-European dem- (house, household). - us: A Latin nominative singular case ending for masculine nouns of the second declension, indicating the subject form.