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Possibly from *plaetus, from Proto-Indo-European *preyH- (to like, feel friendly/well-disposed), comparing with the name Plaetōrius. Cognate with Ancient Greek πρᾶος (prâos), Old English frēo (English free).



laetus (feminine laeta, neuter laetum); first/second declension

  1. happy
    Laetus sum.I (a man) am happy.
    Laeta sum.I (a woman) am happy.


First/second declension.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
nominative laetus laeta laetum laetī laetae laeta
genitive laetī laetae laetī laetōrum laetārum laetōrum
dative laetō laetō laetīs
accusative laetum laetam laetum laetōs laetās laeta
ablative laetō laetā laetō laetīs
vocative laete laeta laetum laetī laetae laeta

Derived termsEdit



  • laetus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • laetus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • laetus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
  • laetus in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • the laughing cornfields: laetae segetes
  • laetus in William Smith, editor (1848) A Dictionary of Greek Biography and Mythology, London: John Murray