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Latin word dominus comes from Proto-Indo-European *demh₂-
*demh₂- (Proto-Indo-European)
to build 20, build, house
*domh₂nos (Proto-Indo-European)
*domanos (Proto-Italic)
dominus (Latin)
A master, possessor, ruler, lord, proprietor. An owner of a residence; the master of its servants and slaves. Sir (greeting). The master of a feast, the entertainer, host. The master of a play or of public games, the employer of players or gladiators.