Definitions from Wiktionary (realm)

▸ noun:  An abstract sphere of influence, real or imagined.
▸ noun:  The domain of a certain abstraction.
▸ noun:  (computing) A scope of operation in networking or security.
▸ noun:  (formal or law) A territory or state, as ruled by a specific power, especially by a king.
▸ noun:  (fantasy, roleplaying games) An otherworldly dimension or domain — magical, ethereal, or otherwise — usually ruled or created by a mystical character.
▸ noun:  (virology, taxonomy) A taxonomic rank in the phylogeny of viruses, higher than kingdoms.

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