Domain

Demesne

A demesne or domain was all the land retained and managed by a lord of the manor under the feudal system for his own use, occupation, or support. This distinguished it from land subinfeudated by him to others as sub-tenants. In contrast, the entire territory controlled by a monarch both directly and indirectly via their tenant lords would typically be referred to as their realm. The concept originated in the Kingdom of France and found its way to foreign lands influenced by it or its fiefdoms.

Estate (land)

An estate is a large parcel of land under single ownership, which generates income for its owner.

Domain (taxonomy)

In biological taxonomy, a domain, also dominion, is the highest taxonomic rank of all organisms taken together. It was introduced in the three-domain system of taxonomy devised by Carl Woese, Otto Kandler and Mark Wheelis in 1990.

domain

Noun

1. A geographic area owned or controlled by a single person or organization.
2. A field or sphere of activity, influence or expertise.