demesne,
domain,
land (mathematics) the set of values of the independent variable for which a function is defined
= synonym
= antonym
= relatert ord
Wiktionary
Substantiv
duchy -
A dominion or region ruled by a duke or duchess.
Wikipedia
A duchy, sometimes referred to as a dukedom, is a territory, fief, or domain ruled by a duke or duchess. Some duchies were sovereign in areas that would become unified realms only during the Modern era. In contrast, others were subordinate districts of those kingdoms that unified either partially or completely during the Medieval era.
