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Learned borrowing from Latin cognatus (kinsman). Doublet of cognate and connate.


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 The imported definitions may be significantly out of date, and any more recent senses may be completely missing.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 adjective

  1. related by blood, kindred
    Synonym: cōnsanguineus
    • 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


First/second-declension adjective.

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



cognātus m (genitive cognātī, feminine cognāta); second declension

  1. a blood relation, blood relative, kinsman


First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Masculine Feminine
Nominative cognātus cognāta cognātī cognātae
Genitive cognātī cognātae cognātōrum cognātārum
Dative cognātō cognātīs cognātīs
Accusative cognātum cognātam cognātōs cognātās
Ablative cognātō cognātā cognātīs cognātīs
Vocative cognāte cognāta cognātī cognātae


  • 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
  • cognatus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
  • cognatus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette