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Latin cognatus (kinsman)


cognatus (plural cognati)

  1. (law) A person connected through cognation.

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 The imported definitions may be significantly out of date, and any more recent senses may be completely missing.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 cognatus in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)



From con- (together) +‎ (g)nātus (born).



cognātus (feminine cognāta, neuter cognātum); first/second declension

  1. related by blood, kindred
    • 4th century, St Jerome, Vulgate, Tobit 2:15
      nam sicut beato Iob insultabant reges ita isti parentes et cognati eius et inridebant vitam eius dicentes (For as the kings insulted over holy Job: so his relations and kinsmen mocked at his life, saying:)
  2. brother or sister; sibling
  3. (figuratively) related, connected, like, similar
  4. (substantive) a blood relation, blood relative, kinsman


First/second declension.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
nominative cognātus cognāta cognātum cognātī cognātae cognāta
genitive cognātī cognātae cognātī cognātōrum cognātārum cognātōrum
dative cognātō cognātō cognātīs
accusative cognātum cognātam cognātum cognātōs cognātās cognāta
ablative cognātō cognātā cognātō cognātīs
vocative cognāte cognāta cognātum cognātī cognātae cognāta



  • cognatus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • cognatus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • du Cange, Charles (1883), “cognatus”, in G. A. Louis Henschel, Pierre Carpentier, Léopold Favre, editors, Glossarium Mediæ et Infimæ Latinitatis (in Latin), Niort: L. Favre
  • cognatus in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français [Illustrated Latin-French Dictionary], Hachette