realm

noun

1. (archaic, rhetoric)A territory or state, as ruled by an absolute authority, especially by a king; a kingdom.

   “And, of this island realm, he and his companion were the undisputed sovereigns.”

   “1913, Leslie Alexander Toke, Catholic Encyclopedia, "St. Dunstan", Then seeing his life was threatened he fled the realm and crossed over to Flanders, […]”

2. (archaic, rhetoric)A territory or state, as ruled by an absolute authority, especially by a king; a kingdom.
3. (archaic, obsolete, rhetoric)A territory or state, as ruled by an absolute authority, especially by a king; a kingdom.
4. (also, figuratively)A sphere of knowledge or of influence; a domain.

   “the realm of physics”

   “the realm of corporate governance”

   “Why should we despise anything in the realm of Buddha?”

   “One thing more which the scientific man does is to accord primacy to that realm of truth which is primary in importance.”

   “At home in Moscow, Mikhail Sergeyevitch Gorbachev, who had launched a campaign to rejuvenate the Soviet realm […]”

5. A primary zoogeographical division of the earth's surface.
6. A taxonomic rank in the phylogeny of viruses, higher than kingdoms.
7. (archaic)A region or zone forming part of a cosmological system.