from
The Collaborative International Dictionary of English v.0.48
Demesne \De*mesne"\, n. [OE. demeine, demain, rule, demesne, OF.
demeine, demaine, demeigne, domaine, power, F. domaine
domain, fr. L. dominium property, right of ownership, fr.
dominus master, proprietor, owner. See {Dame}, and cf.
{Demain}, {Domain}, {Danger}, {Dungeon}.] (Law)
A lord's chief manor place, with that part of the lands
belonging thereto which has not been granted out in tenancy;
a house, and the land adjoining, kept for the proprietor's
own use. [Written also {demain}.] --Wharton's Law Dict.
Burrill.
[1913 Webster]
{Ancient demesne}. (Eng. Law) See under {Ancient}.
[1913 Webster]