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From Proto-Indo-European *dl̥h₁gʰós ‎(long). Compare English long, Ancient Greek δολιχός ‎(dolikhós); compare also λαγγάζω ‎(langázō) and λογγάζω ‎(longázō).



longus m ‎(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
  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


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  • longus” in Charlton T. Lewis & Charles Short, A Latin Dictionary, Oxford: Clarendon Press, 1879.