Domicile is from Old French domicile, from Latin domicilium ('dwelling place'), from domus ('house'). The ancestry passes through Old French domicile, Latin domicilium, Latin domus, and Proto-Indo-European *dem-. In present use as noun and verb, it means "a person's permanent legal residence", keeping the historical formation close to the word's ordinary semantic work. Related words include domestic, dome, and domus; derived forms include domiciled, domiciliary, and domiciliation. The surrounding word family keeps the same base visible in domiciled, domiciliary, domiciliation, domestic, dome, and domus, showing how the headword belongs to a larger cluster rather than standing alone.