From agō (to act) +‎ -īvus. In the grammatical sense, it is a calque of Ancient Greek ἐνεργητικός (energētikós).



āctīvus (feminine āctīva, neuter āctīvum, adverb āctīvē); first/second-declension adjective

  1. active
  2. practical
  3. (grammar) active (of a verb)


First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative āctīvus āctīva āctīvum āctīvī āctīvae āctīva
Genitive āctīvī āctīvae āctīvī āctīvōrum āctīvārum āctīvōrum
Dative āctīvō āctīvō āctīvīs
Accusative āctīvum āctīvam āctīvum āctīvōs āctīvās āctīva
Ablative āctīvō āctīvā āctīvō āctīvīs
Vocative āctīve āctīva āctīvum āctīvī āctīvae āctīva

Derived termsEdit


  • Catalan: actiu
  • English: active
  • French: actif
  • Indonesian: aktif
  • Italian: attivo
  • Norman: acti


  • activus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • activus 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)
  • activus in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
  • Carl Meißner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • (ambiguous) to put the finishing touch to a work: extrema manus accēdit operi (active extremam manum imponere operi)
    • (ambiguous) to be some one's favourite: in amore et deliciis esse alicui (active in deliciis habere aliquem)