Definitions
1.nounAn abstract sphere of influence, real or imagined.
2.nounThe domain of a certain abstraction.
3.nounA scope of operation in networking or security.
4.nounA territory or state, as ruled by a specific power, especially by a king.
5.nounAn otherworldly dimension or domain — magical, ethereal, or otherwise — usually ruled or created by a mystical character.
6.nounA taxonomic rank in the phylogeny of viruses, higher than kingdoms.