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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).



rēgnum n (genitive rēgnī); second declension

  1. royal power, power, control, reign
  2. kingdom, realm, throne
    Sum sine rēgnō.I am without a kingdom.
    • 29 BCE – 19 BCE, Virgil, Aeneid 4.199–200:
      Templa Iovī centum lātīs immānia rēgnīs,
      centum ārās posuit [...].
      [Iarbas] in his far-reaching realms had built a hundred great temples, a hundred altars, for Jupiter.
      (See: Iarbas, Iovi.)
  3. kingship, royalty
    • 8 CE, Ovid, Fasti 5.461–462:
      ‘quī modo, sī volucrēs habuissem rēgna iubentēs,
      in populō potuī maximus esse meō’
      “I who just now, if I would have had the bird-omens ordaining kingship, I might have been able to be the greatest among my people.”
      (The ghost of Remus laments how the auspices or bird-omens instead favored his brother Romulus to be king; see Romulus and Remus.)
  4. in a negative sense: despotism, tyranny, aspiring to or seeking the throne or royal power during the Roman Republic
    • 8 CE, Ovid, Fasti 6.189–190:
      vīxit, ut occīderet damnātus crīmine rēgnī:
      hunc illī titulum longa senecta dabat.
      He lived, that he might die, having been condemned in the crime of [aspiring to] royal power: This [is] the title that was given him in old age.
      (See: Marcus Manlius Capitolinus.)


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 terms[edit]



  • 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