Latin regius, from rex, regis (a king).


regius (not comparable)

  1. Of or relating to a king; royal.
    regius professor, regius professorship
    regius chair

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for regius in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)




Derived from the oblique stem reg- of rēx (king, ruler) +‎ -ius (adjective-forming derivational suffix).



rēgius (feminine rēgia, neuter rēgium); first/second-declension adjective

  1. Of or pertaining to a king; kingly, regal, royal.
  2. Magnificent, splendid, distinguished, worthy of a king.


First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative rēgius rēgia rēgium rēgiī rēgiae rēgia
Genitive rēgiī rēgiae rēgiī rēgiōrum rēgiārum rēgiōrum
Dative rēgiō rēgiō rēgiīs
Accusative rēgium rēgiam rēgium rēgiōs rēgiās rēgia
Ablative rēgiō rēgiā rēgiō rēgiīs
Vocative rēgie rēgia rēgium rēgiī rēgiae rēgia

Derived termsEdit


  • Catalan: regi
  • English: regious
  • Italian: regio
  • Spanish: regio


  • regius in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • regius in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • regius in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
  • regius in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • monarchy: imperium singulare, unius dominatus, regium imperium
    • to assume a despotic tone: regios spiritus sibi sumere
    • to destroy a despotism, tyranny: regios spiritus reprimere (Nep. Dion. 5. 5)