demesne

1 a part or portion having no fixed boundaries the vast and frozen demesne of the northern tundra Synonyms area, region, field, zoneRelated Words corner, section; locale, locality, location, locus, place, point, position, site, space, spot

2 a region of activity, knowledge, or influence the view that the issue is not in the demesne of the courts and is something that should be decided by the state legislature Synonyms area, arena, bailiwick, barony, business, circle, field, department, discipline, domain, element, fief, fiefdom, firmament, front, game, kingdom, line, precinct, province, realm, specialty, sphere, terrain, walkRelated Words frontier; study, subject; territory, turf; occupation, profession, pursuit, racket, vocation; ambit, amplitude, breadth, compass, confine, dimension(s), extent, ken, reach, scope, sweep, width; subfield, subspecialty

3 the area around and belonging to a building the mansion's huge demesne covers more than 100 acres Synonyms ground, park, premises (also premisses), yardRelated Words acres, estate, land, lot, parcel, plot, property, real estate, realty; campus; backyard, churchyard, dooryard, schoolyard; close, enclosure (also inclosure), garden, garth, plaza