Etymology and origin of the Latin word actum
- Confidence
- Established
- Formation
- Derivation
- First attested
- 81–43 BC, Cicero
- Ultimate origin
- Proto-Indo-European (*h₂eǵ-)
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
- (usually plural) An act, deed, transaction; exploits.[1][6][5]
- Official acts, decrees, enactments.[1][5]
- A written record; the official gazette.[1][5]
Related words
References
- ^ 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
- ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
- ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
- ^ a b c d e Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
- ^ a b c d Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
- ^ Wiktionary, the free dictionary, https://en.wiktionary.org
Borrowed into
- French acte
Cite this entry
“Actum.” Etymologically, 18 Oct. 2026, etymologically.com/la/actum. Accessed 19 Oct. 2026.
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