(in England) a landed estate or territorial unit, originally of the nature of a feudal lordship, consisting of a lord's demesne and of lands within which he has the right to exercise certain privileges, exact certain fees, etc.

any similar territorial unit in medieval Europe, as a feudal estate.

the mansion of a lord with the land belonging to it.

the main house or mansion on an estate, plantation, etc.

noun

castle , chateau , estate , house , land , mansion , villa