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Alternative forms[edit]


Etymology 1[edit]

From afficiō (I 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 noun.

Case Singular Plural
Nominative affectus affectūs
Genitive affectūs affectuum
Dative affectuī affectibus
Accusative affectum affectūs
Ablative affectū affectibus
Vocative affectus affectūs
  • Catalan: afecte
  • Galician: afecto
  • Italian: affetto
  • Portuguese: afeto
  • Spanish: afecto


Etymology 2[edit]

Perfect passive participle of afficiō.


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

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

First/second-declension adjective.

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
  • affectus 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)
  • 1 adfectus in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, 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)