From Latin rēgnum (kingdom). Doublet of reign.



regnum (plural regnums or regna)

  1. (biology, taxonomy) A rank in the classification of organisms, below dominium and above divisio.
    Synonym: kingdom
  2. A badge of royalty, especially the early form of the pope's tiara.




From rēx (king).


  • (Classical) IPA(key): /ˈreːɡ.num/, [ˈreːŋnʊ̃ˑ]
  • (Ecclesiastical) IPA(key): /ˈreɲ.ɲum/, [ˈrɛɲːum]
  • (file)


rēgnum n (genitive rēgnī); second declension

  1. royal power, power, control, kingdom, reign
    Sum sine regno.I am without a kingdom.
  2. kingship, royalty


Second-declension noun (neuter).

Case Singular Plural
Nominative rēgnum rēgna
Genitive rēgnī rēgnōrum
Dative rēgnō rēgnīs
Accusative rēgnum rēgna
Ablative rēgnō rēgnīs
Vocative rēgnum rēgna

Derived termsEdit



  • regnum in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • regnum in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • regnum in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
  • regnum in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
  • Carl Meißner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to take upon oneself absolute power: imperium, regnum, tyrannidem occupare
    • to aspire to the sovereignty: regnum appetere (B. G. 7. 4)
    • to obtain the sovereignty, kingly office: regnum adipisci
    • to invest some one with royal power: alicui regnum deferre, tradere
    • to restore a king to his throne (not in solium): aliquem in regnum restituere
    • (ambiguous) to depose a king: aliquem regno spoliare or expellere (Div. 1. 22. 74)
  • regnum in William Smith, editor (1854, 1857) A Dictionary of Greek and Roman Geography, volume 1 & 2, London: Walton and Maberly