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From Latin āctus (a cattle drive; a cattle path; units of length and area).


actus (plural acti)

  1. (historical units of measure) A former Roman unit of length, equal to 120 Roman feet (about 35½ m)
  2. (historical units of measure) A former Roman unit of area, equivalent to a square with sides of 1 actus (aboutha)



  • "actus, n.", in the Oxford English Dictionary, Oxford: Oxford University Press.




actus f

  1. plural of actu



Etymology 1Edit

Perfect passive participle of agō (make, do).


āctus (feminine ācta, neuter āctum); first/second-declension participle

  1. made, done, having been done.

First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative āctus ācta āctum āctī āctae ācta
Genitive āctī āctae āctī āctōrum āctārum āctōrum
Dative āctō āctō āctīs
Accusative āctum āctam āctum āctōs āctās ācta
Ablative āctō āctā āctō āctīs
Vocative ācte ācta āctum āctī āctae ācta

Etymology 2Edit

From agō (do, make, drive) +‎ -tus (suffix forming fourth declension action nouns from verbs).


āctus m (genitive āctūs); fourth declension

  1. act, action, doing, deed
  2. performance, behavior
  3. a cattle drive, the act of driving cattle or a cart
  4. a cattle path or narrow cart track
  5. (historical units of measure) An actus: a former Roman unit of length equal to 120 Roman feet (about 35½ m)
  6. (historical units of measure) An actus: a former Roman unit of area equivalent to a square with sides of 1 actus (aboutha)

Fourth-declension noun.

Case Singular Plural
Nominative āctus āctūs
Genitive āctūs āctuum
Dative āctuī āctibus
Accusative āctum āctūs
Ablative āctū āctibus
Vocative āctus āctūs
Derived termsEdit
Related termsEdit
  • Aragonese: acto
  • Asturian: actu
  • Catalan: acte
  • Corsican: attu
  • English: act
  • French: acte
  • Friulian: at
  • Galician: acto
  • Irish: acht
  • Italian: atto
  • Neapolitan: atto
  • Occitan: acte
  • Portuguese: acto, ato, auto
  • Romanian: act
  • Romansch: act
  • Russian: акт m (akt)
  • Sardinian: atu, attu
  • Sicilian: attu
  • Spanish: acto
  • Swedish: akt
  • Venetian: ato


  • actus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • actus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • actus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
  • actus in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • an act: actus
    • (ambiguous) I'm undone! it's all up with me: perii! actum est de me! (Ter. Ad. 3. 2. 26)
    • (ambiguous) to have all one's trouble for nothing: rem actam or simply actum agere (proverb.)
    • (ambiguous) rest after toil is sweet: acti labores iucundi (proverb.)
    • (ambiguous) it's all over with me; I'm a lost man: actum est de me
    • (ambiguous) a good conscience: conscientia recta, recte facti (factorum), virtutis, bene actae vitae, rectae voluntatis
    • (ambiguous) to declare a magistrate's decisions null and void: acta rescindere, dissolvere (Phil. 13. 3. 5)
    • (ambiguous) amnesty (ἀμνηρτία): ante actarum (praeteritarum) rerum oblivio or simply oblivio
  • actus in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • actus in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin