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From cognōscō (to get to know) +‎ -tiō (resultative noun suffix).



cognitiō f (genitive cognitiōnis); third declension

  1. learning, study (acquisition of knowledge)
    Synonyms: studium, disciplīna
  2. knowledge, cognition, cognizance
    Synonyms: scientia, sapientia, ērudītiō
    Antonym: ignōrantia
  3. (law) investigation, judicial examination, inquiry, cognizance, trial
    Synonym: causa


Third-declension noun.

Case Singular Plural
Nominative cognitiō cognitiōnēs
Genitive cognitiōnis cognitiōnum
Dative cognitiōnī cognitiōnibus
Accusative cognitiōnem cognitiōnēs
Ablative cognitiōne cognitiōnibus
Vocative cognitiō cognitiōnēs

Related terms[edit]



  • cognitio”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • cognitio”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • cognitio 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)
  • cognitio in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette
  • Carl Meißner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to be well-informed, erudite: multarum rerum cognitione imbutum esse (opp. litterarum or eruditionis expertem esse or [rerum] rudem esse)
    • to have innate ideas of the Godhead; to believe in the Deity by intuition: insitas (innatas) dei cognitiones habere (N. D. 1. 17. 44)