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

1250–1300; Middle English realme, reaume < Old French reialme, derivative of reial < Latin rēgālis regal

underrealm, noun

1. See kingdom. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
realm (rɛlm)
1.  a royal domain; kingdom (now chiefly in such phrases as Peer of the Realm)
2.  a field of interest, study, etc: the realm of the occult
[C13: from Old French reialme, from Latin regimen rule, influenced by Old French reial royal, from Latin rēgālisregal1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 13c., from O.Fr. reaume, probably from roiaume "kingdom," altered (by influence of L. regalis "regal") from Gallo-Romance *regiminem, accusative form of L. regimen "system of government, rule" (see regimen).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Cutting-edge technology is no longer an exotic realm where experts rule.
Over in the plant lab, hands-on exhibits take basic botany lessons out of the
  textbook realm.
But then there is the realm of fashion made from actual food.
How lineages might change is squarely within the realm of speculation.
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