Etymologically

Etymology and origin of the Latin word actum

Confidence
Established
Formation
Derivation
First attested
81–43 BC, Cicero
Ultimate origin
Proto-Indo-European (*h₂eǵ-)
Etymology tree
inherited borrowed derived
Latin actum
French acte

Forms

actum n (genitive actī); second declension; usually plural, acta[1]

Etymology

It is the neuter of āctus, the perfect passive participle of agō (“to do, drive”), used as a noun: “a thing done”.[1][2] De Vaan traces ⟨agō⟩ to Proto-Italic *ag-e/o- and Proto-Indo-European *h₂eǵ-e/o- (“to drive, lead”), cognate with Oscan acum (“to act”) and Ancient Greek ἄγω (ágō, “to lead”).[3]

Earliest recorded meaning

Köbler's first source is Cicero.[4] In De oratore he says that in great matters one looks first for plans, then acts (ācta), then outcomes.[1]

Semantic evolution

The plural ācta are acts, deeds and transactions, and great exploits, as the labours of Hercules;[1] Sallust's soldiers tell one another of their deeds.[1] In public life they are the official acts and decrees of a magistrate or ruler: Cicero argued that ācta Caesaris, Caesar's acts, should be upheld.[1] They are also written records, especially the official gazette of the business of the senate and people, which Cicero waited to receive.[1]

Church Latin glosses ācta “things done, acts, records of a process, register of public acts”.[5] Medieval sources from Aldhelm on use it.[4] English act comes from āctum, at first a legal term, as well as from āctus.[2]

Timeline

  • 81–43 BC – Cicero of deeds, of Caesar's acts and of the gazette.[1][4]
  • 86–34 BC – Sallust of soldiers' exploits.[1][4]
  • 639–709 AD – Aldhelm.[4]
  • late 14th century – English act “a thing done”.[2]

Meanings

Noun

  1. (usually plural) An act, deed, transaction; exploits.[1][6][5]
  2. Official acts, decrees, enactments.[1][5]
  3. A written record; the official gazette.[1][5]

References

  1. ^ a b c d e f g h i j k l Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  2. ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  3. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  4. ^ a b c d e Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  5. ^ a b c d Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
  6. ^ Wiktionary, the free dictionary, https://en.wiktionary.org

Borrowed into

Cite this entry

“Actum.” Etymologically, 18 Oct. 2026, etymologically.com/la/actum. Accessed 19 Oct. 2026.

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