1. a royal domain; kingdom: the realm of England.
  2. the region, sphere, or domain within which anything occurs, prevails, or dominates: the realm of dreams.
  3. the special province or field of something or someone: the realm of physics; facts within the realm of political scientists.


  1. a royal domain; kingdom (now chiefly in such phrases as Peer of the Realm)
  2. a field of interest, study, etcthe realm of the occult

late 13c., “kingdom,” from Old French reaume, probably from roiaume “kingdom,” altered (by influence of Latin regalis “regal”) from Gallo-Romance *regiminem, accusative form of Latin regimen “system of government, rule” (see regimen). Transferred sense “sphere of activity” is from late 14c.

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