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From *fortu- (chance, luck, fortune) +‎ -ītus (adjective-forming suffix). Derived from an unattested u-stem action noun *fortus built on the root of fors (chance, luck) (reconstructed as Proto-Indo-European *bʰer-) + the action noun suffix *-tus; an u-stem formation also seems to be behind fortūna (fortune, luck, destiny).[1] Compare the formation of grātuītus.



fortuītus (feminine fortuīta, neuter fortuītum, adverb fortuītō); first/second-declension adjective

  1. happening by chance, accidental, random, fortuitous


First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative fortuītus fortuīta fortuītum fortuītī fortuītae fortuīta
Genitive fortuītī fortuītae fortuītī fortuītōrum fortuītārum fortuītōrum
Dative fortuītō fortuītō fortuītīs
Accusative fortuītum fortuītam fortuītum fortuītōs fortuītās fortuīta
Ablative fortuītō fortuītā fortuītō fortuītīs
Vocative fortuīte fortuīta fortuītum fortuītī fortuītae fortuīta

Related terms[edit]


  • Catalan: fortuït
  • English: fortuitous
  • Spanish: fortuito
  • Portuguese: fortuito
  • French: fortuit


  1. ^ De Vaan, Michiel (2008) “fors”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 236

Further reading[edit]

  • fortuitus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • fortuitus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • fortuitus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
  • fortuitus in Ramminger, Johann (2016 July 16 (last accessed)) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700[1], pre-publication website, 2005-2016
  • Charlton T. Lewis (1891) An Elementary Latin Dictionary, 1st edition. (Oxford University Press)