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Alternative forms[edit]


Etymology 1[edit]

From afficiō (affect) +‎ -tus (action noun-forming suffix).


affectus m (genitive affectūs); fourth declension

  1. affection, mood, emotion, feeling
  2. affection, fondness, compassion, sympathy, love

Fourth declension.

Case Singular Plural
nominative affectus affectūs
genitive affectūs affectuum
dative affectuī affectibus
accusative affectum affectūs
ablative affectū affectibus
vocative affectus affectūs


Etymology 2[edit]


affectus m (feminine affecta, neuter affectum); first/second declension

  1. (having been) endowed with, possessed of
  2. (having been) affected
  3. (having been) impaired, (having been) weakened

First/second declension.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
nominative affectus affecta affectum affectī affectae affecta
genitive affectī affectae affectī affectōrum affectārum affectōrum
dative affectō affectō affectīs
accusative affectum affectam affectum affectōs affectās affecta
ablative affectō affectā affectō affectīs
vocative affecte affecta affectum affectī affectae affecta


  • 1. affectus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • du Cange, Charles (1883), “affectus”, in G. A. Louis Henschel, Pierre Carpentier, Léopold Favre, editors, Glossarium Mediæ et Infimæ Latinitatis (in Latin), Niort: L. Favre
  • 1 adfectus in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français [Illustrated Latin-French Dictionary], Hachette, page 34
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to be seriously ill: gravi morbo affectum esse, conflictari, vexari
    • to be so disposed: ita animo affectum esse
  • affectus²” on page 77 of the Oxford Latin Dictionary (1st ed., 1968–82)