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From Proto-Italic *dlongos, from Proto-Indo-European *dl̥h₁gʰós. Cognate with Proto-Germanic *langaz, English long.



longus (feminine longa, neuter longum); first/second declension

  1. (of space) far, long; extended, prolonged
  2. (of time) long; tedious, laborious
    • c. 4 BCE – 65 CE, Seneca the Younger, De brevitate vitae 13
      Persequi singulos longum est quorum aut latrunculi aut pila aut excoquendi in sole corporis cura consumpsere uitam.
      It would be tedious to mention all the different men who have spent the whole of their life over chess or ball or the practice of baking their bodies in the sun.
  3. (of speech or writing) long-winded, lengthy
    Longum iter per praecepta, breve per exempla.
    (Education is) a long road by lessons, a short one by examples.
  4. great, vast, spacious
  5. remote, distant, far off


First/second declension.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
nominative longus longa longum longī longae longa
genitive longī longae longī longōrum longārum longōrum
dative longō longō longīs
accusative longum longam longum longōs longās longa
ablative longō longā longō longīs
vocative longe longa longum longī longae longa


Derived terms[edit]

Related terms[edit]



  • longus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • longus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • du Cange, Charles (1883), “longus”, in G. A. Louis Henschel, Pierre Carpentier, Léopold Favre, editors, Glossarium Mediæ et Infimæ Latinitatis (in Latin), Niort: L. Favre
  • longus in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français [Illustrated Latin-French Dictionary], Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to accomplish a long journey: longam viam conficere
    • (ambiguous) this word ends in a long syllable: haec vox longa syllaba terminatur, in longam syllabam cadit, exit
    • not to be prolix: ne longus, multus sim
    • (ambiguous) at a great distance: longo spatio, intervallo interiecto
    • (ambiguous) to finish a very long journey: longum itineris spatium emetiri
    • (ambiguous) after a fairly long interval: satis longo intervallo
    • (ambiguous) this word ends in a long syllable: haec vox longa syllaba terminatur, in longam syllabam cadit, exit
    • (ambiguous) to begin with a long syllable: oriri a longa (De Or. 1. 55. 236)
    • (ambiguous) a man-of-war: navis longa
    • (ambiguous) not to be prolix: ne longum sit
  • longus in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • longus in William Smith, editor (1848) A Dictionary of Greek Biography and Mythology, London: John Murray
  • longus in William Smith, editor (1854, 1857) A Dictionary of Greek and Roman Geography, volume 1 & 2, London: Walton and Maberly