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


actus (plural actus or acti)

  1. (historical units of measure) A former Roman unit of length, equal to 120 Roman feet (about 35.5 m)
  2. (historical units of measure) A former Roman unit of area, equivalent to a square with sides of 1 actus (about 0.125 ha)



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




  • (file)


actus f

  1. plural of actu



Etymology 1[edit]

Perfect passive participle of agō (make, do). Compare Sanskrit अक्त (akta, driven).


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 2[edit]

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


āctus m (genitive āctūs); fourth declension

  1. act, action, doing, deed
    Synonyms: āctiō, factum, rēs, gestum, facinus
    actum est de aliquoIt is over for someone, the fate of someone is sealed
  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) actus (a former Roman unit of length equal to 120 Roman feet (about 35.5 m))
  6. (historical units of measure) actus (a former Roman unit of area equivalent to a square with sides of 1 actus (about 0.125 ha))

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 terms[edit]
Related terms[edit]
  • Aragonese: acto
  • Asturian: actu
  • Catalan: acte
  • Corsican: attu
  • French: acte
    • Romanian: act
  • Friulian: at
  • Galician: acto
  • German: Akt
    • Norwegian Bokmål: akt
    • Polish: akt (semantic loan)
  • Irish: acht
  • Italian: atto
  • Neapolitan: atto
  • Norwegian Bokmål: akt
  • Occitan: acte
  • Old French: acte
    • English: act
  • Old Galician-Portuguese: auto
  • Portuguese: ato
  • Romansch: act
  • Russian: акт m (akt)
  • Sardinian: atu, attu
  • Sicilian: attu
  • Spanish: auto
  • 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 Enrico Olivetti, editor (2003-2023) Dizionario Latino, Olivetti Media Communication
  • actus 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)
  • 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