From Middle English rewme, realme, reaume, from Old French reaume, realme ("kingdom"), of unclear origins.

• (British, America) enPR: rĕlm, IPA: /ɹɛlm/

realm (plural realms)

1. An abstract sphere of influence, real or imagined.
   • 1907, Tada Kanai, “The World and How to Pass Through It”, in Arthur Lloyd, transl., Seven Buddhist Sermons:

     Why should we despise anything in the realm of Buddha?

2. The domain of a certain abstraction.
   • 1922, Judson Eber Conant, “Truth Must be Classified Scientifically”, in The Church The Schools and Evolution:

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

3. (computing) A scope of operation in networking or security.
4. (formal or legal) A territory or state, as ruled by a specific power, especially by a king.
   • 1913, Leslie Alexander Toke, Catholic Encyclopedia, "St. Dunstan",

     Then seeing his life was threatened he fled the realm and crossed over to Flanders, […]

5. (fantasy, RPG) An otherworldly dimension or domain — magical, ethereal, or otherwise — usually ruled or created by a mystical character.
6. (virology, taxonomy) A taxonomic rank in the phylogeny of viruses, higher than kingdoms.

• (a territory or state) country, land, kingdom
• (a sphere of activity or influence) field, province

• Italian: reame, regno, dominio, sfera, ambito
• Portuguese: domínio, campo, reino, âmbito
• Russian: о́бласть
• Spanish: esfera

• French: domaine
• Italian: dominio

• French: royaume
• German: Reich, Königreich, Kaiserreich
• Italian: reame, regno
• Portuguese: reino
• Russian: короле́вство
• Spanish: reino