A state under the rule of two people; the form of government of such state.
Rule by two people.
A territory or state, as ruled by a specific power, especially by a king.
A taxonomic rank in the phylogeny of viruses, higher than kingdoms.
A scope of operation in networking or security.
An abstract sphere of influence, real or imagined.
An otherworldly dimension or domain — magical, ethereal, or otherwise — usually ruled or created by a mystical character.
The domain of a certain abstraction.