Princeton's WordNet

1. kingdom, land, realm(noun)

   a domain in which something is dominant

   "the untroubled kingdom of reason"; "a land of make-believe"; "the rise of the realm of cotton in the south"

2. kingdom, realm(noun)

   the domain ruled by a king or queen

3. region, realm(noun)

   a knowledge domain that you are interested in or are communicating about

   "it was a limited realm of discourse"; "here we enter the region of opinion"; "the realm of the occult"

Wiktionary

1. realm(Noun)

   An abstract sphere of influence, real or imagined.

2. realm(Noun)

   The domain of a certain abstraction.

3. realm(Noun)

   A territory or state, as ruled by a specific power, and particularly those territories ruled by a king.

Origin: From reaume, realme, of unclear origins. A postulated , cross of regimen with regalis is usually cited.

Webster Dictionary

1. Realm(noun)

   a royal jurisdiction or domain; a region which is under the dominion of a king; a kingdom

2. Realm(noun)

   hence, in general, province; region; country; domain; department; division; as, the realm of fancy

• rykAfrikaans
• مَمْلَكَهArabic
• царствоBulgarian
• reinoPortuguese (BR)
• královstvíCzech
• das KönigreichGerman
• kongerigeDanish
• βασίλειοGreek
• reinoSpanish
• kuningriikEstonian
• کشور پادشاهیFarsi
• kuningaskuntaFinnish
• royaumeFrench
• מַמלָכָהHebrew
• राज्यHindi
• kraljevstvoCroatian
• királyság, birodalomHungarian
• kerajaanIndonesian
• konungsríkiIcelandic
• regno, reameItalian
• 王国Japanese
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• karaliste; karaļvalstsLatvian
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• پاچهى، سلطنت، سيمه، ولايتPashto
• reinoPortuguese
• regatRomanian
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• 王国Chinese (Simp.)