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See also: Actio



From āctum +‎ -tiō, using the supine of agō (do, make).



āctiō f (genitive āctiōnis); third declension

  1. action; a doing or performing, behavior
  2. public function, civil act
  3. (law) suit, process, action
  4. gesticulation made while speaking
  5. (drama) the action, plot, series of events


Third declension.

Case Singular Plural
nominative āctiō āctiōnēs
genitive āctiōnis āctiōnum
dative āctiōnī āctiōnibus
accusative āctiōnem āctiōnēs
ablative āctiōne āctiōnibus
vocative āctiō āctiōnēs

Related terms[edit]



  • actio in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • actio in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • du Cange, Charles (1883), “actio”, in G. A. Louis Henschel, Pierre Carpentier, Léopold Favre, editors, Glossarium Mediæ et Infimæ Latinitatis (in Latin), Niort: L. Favre
  • actio in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français [Illustrated Latin-French Dictionary], Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • practical philosophy: philosophia, quae in actione versatur
    • the treatment of the piece: actio
    • delivery: actio (Brut. 38)
    • the delivery is rather halting, poor: actio paulum claudicat
    • a private, civil prosecution: actio, petitio
  • actio in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • actio in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin



act +‎ -io



actio (first-person singular present actiaf)

  1. to act



Welsh mutation
radical soft nasal h-prothesis
actio unchanged unchanged hactio
Note: Some of these forms may be hypothetical. Not every
possible mutated form of every word actually occurs.

Further reading[edit]

  • actio”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies, 2014