- Law possession (of real estate) in one's own right
- Historical the land or estate belonging to a lord and not rented or let but kept in his hands
- the land around a mansion; lands of an estate
- a region or domain: also used fig.
Origin of demesneMiddle English and Old French demeine from Classical Latin dominium (see domain); spelling, spelled altered by associated, association with Old French mesnee, household from Classical Latin mansio: see mansion