Etymologically

Etymology and origin of the Italian word atto

Italian has two words spelled atto: the noun “act”, from Latin actus, and the adjective “fit, suitable”, from Latin aptus.[1][2][3] DELI, Nocentini and GRADIT number the noun 1 and the adjective 2.[1][3][2]

atto1 act

Confidence
Established
Formation
Borrowing
First attested
1276, Panuccio del Bagno
Borrowed from
Latin actus
Ultimate origin
Proto-Indo-European *h₂eǵ-
Etymology tree of atto1
inherited borrowed derived
Latin ago
French agir
Latin actus
English act
Italian atto
From the same root · atto1
Latin abigo ← ago
Latin actio ← ago
Latin activus ← ago
Latin actrix ← ago
Latin adigo ← ago
Latin agilis ← ago
Latin agito ← ago
Latin ambigo ← ago
Latin circumago ← ago
Latin cogo ← ago
Latin dego ← ago
Latin indago ← ago
Latin perago ← ago
Latin prodigo ← ago
Latin redigo ← ago
Latin subigo ← ago
Latin actor ← actus
Latin actuosus ← actus

Pronunciation

Forms

atto m (plural atti)[4]

Etymology

The act is borrowed from Latin āctus (“a doing, an action; act of a play”), the action noun of agō (“to drive, to do”).[5][6][7][4] Nocentini and DELI start from the neuter āctum (“a thing done”), the past participle used as a noun, and Nocentini sees the noun āctus merged with it, especially in the senses “part of a play” and “legal act”;[3][1] GRADIT also points to the plural ācta (“deeds, records”).[2] DEI and the LEI call it semi-learned.[5][7]

The same word is French acte, Catalan acte, Spanish acto, Portuguese auto and Romanian act;[7][3] Spanish and Portuguese also have the directly transmitted auto, and the phrase Portuguese auto da fé came into Italian through French autodafé.[3][7] The Italian phrase for an act of parliament is a calque of English act of parliament.[1][7]

The Latin verb continues Proto-Italic *agō, from Proto-Indo-European *h₂eǵ- (“to drive, to lead”), the root of Ancient Greek ἄγω (ágō, “to lead”) and Sanskrit अजति (ájati, “drives”).[8][4]

Earliest recorded meaning

The LEI's first record of the sense “deed, action”, as the realisation of a will open to moral judgement, is in Panuccio del Bagno (1276).[7] DELI's first is the philosophical sense, “what is realised” as opposed to what is only possible, in the late-13th-century Italian translation of Brunetto Latini's Tresor.[1]

Semantic evolution

The sense “behaviour, action” appears in Jacopone da Todi (before 1306), “exercise of an office” in Dante (before 1321), and “document with legal force” in Dino Compagni (1310–1312).[1] The theatrical sense, each part into which a play is divided, is recorded early in the 14th century in a translation of Cicero,[1][9] and passed into German as Atto (1802).[9] The plural atti, the written record of the decisions of an assembly or meeting, is in Guicciardini (before 1540), and “oral declaration” in Segneri (1669).[1]

In the 17th century atto also became the name of the short prayers that profess a virtue, such as the atto di fede and the atto di dolore.[10][6] Fixed phrases include all'atto pratico, when it comes to doing it, and nell'atto di, at the very moment of doing something.[6][2]

Timeline

  • 1276 – Panuccio del Bagno uses atto for “deed”.[7]
  • Late 13th century – The philosophical sense appears in the translation of the Tresor.[1]
  • Before 1306 – Jacopone da Todi uses it for “behaviour”.[1]
  • 1310–1312 – Dino Compagni uses it for a legal document.[1]
  • Early 14th century – The theatrical sense is recorded.[1]
  • Before 1540 – Guicciardini uses atti for the record of an assembly.[1]
  • 17th century – Atto names a prayer such as the atto di fede.[10]
  • 1802 – German Atto “act of a play” is recorded.[9]

Meanings

Noun

  1. An act, a deed that shows a will or feeling: un atto di generosità.[2][6][11]
  2. A gesture, movement: Fece l'atto di alzarsi, poi si fermò.[2][12]
  3. An attitude, posture: in atto di preghiera.[2][11]
  4. (philosophy) actuality, what is fully realised, as opposed to potency.[2][11]
  5. (theatre) An act of a play or opera: una commedia in tre atti.[2][11][12]
  6. (law) A deed, document or act with legal force; in the plural, the records or proceedings of a body.[4][6][12]
  7. (religion) A short prayer professing a virtue: atto di fede, atto di dolore.[6][10]

Word family

  • atteggiare
  • atteggiamento
  • attuale
  • attualità
  • attuare
  • attuazione

atto2 fit, suitable

Confidence
Established
Formation
Inherited
First attested
1298, Questioni filosofiche
Inherited from
Latin aptus
Ultimate origin
Latin apiō
Etymology tree of atto2
inherited borrowed derived
Latin aptus
Italian atto

Pronunciation

Forms

atto (feminine atta, masculine plural atti, feminine plural atte)[4]

Etymology

The adjective is inherited from Latin aptus (“fastened; fitting, suited”), the past participle of apiō (“to fasten, to tie”), whose sense moved from “well attached” to “suited”.[1][3][2][5] The LEI counts it among the popular continuations of the Latin word, with Old French ate and Old Occitan at (“what is needed”); forms written with p before t only follow Latin spelling.[13][3][14] The learned forms are French apte and Spanish apto.[3][13]

Nocentini places the rare Latin verb in the oldest Indo-European vocabulary and compares Sanskrit आप्नोति (āpnoti, “reaches, obtains”), as well as Hittite ēpmi (“I take”).[3] Wiktionary also connects it with Proto-Indo-European *h₂ep- (“to join, to fit”).[4]

Earliest recorded meaning

The TLIO's first record is in the Questioni filosofiche (1298, south-eastern Tuscany), in the sense “well suited to a purpose”.[15] DELI and the LEI give Jacopone da Todi (before 1306) for “capable, apt” of a person.[1][13]

Semantic evolution

In Old Italian atto also meant “inclined, liable to”, “orderly” and “worthy”, and atto a before a verb came close to the suffix -abile.[15] Boccaccio used it for “fitting”, and Ariosto for “nimble, agile”, a sense now archaic.[10][6] Dialects keep it in Lucca for “ready, inclined” and in Orvieto for “capable”.[14][10] In the modern language it is mostly a formal and bureaucratic word, as in atto alle armi, fit for military service.[6][12]

Timeline

  • 1298 – Atto “suited” appears in the Questioni filosofiche.[15]
  • Before 1306 – Jacopone da Todi uses it for “capable”.[1]
  • c. 1312 – Dino Compagni uses atto a for “fit for”.[13]

Meanings

Adjective

  1. (formal) Fit, qualified, suitable (with a): È stato giudicato atto al lavoro in quota.[2][6][11]
  2. Appropriate, adequate to a purpose: Servono strumenti atti a misurare la pressione.[2][6][11]
  3. (archaic) nimble, agile.[2][6][12]

Word family

  • riattare

References

  1. ^ a b c d e f g h i j k l m n o p Cortelazzo, Manlio; Zolli, Paolo (1999), Dizionario etimologico della lingua italiana, 2nd ed. by Manlio Cortelazzo and Michele A. Cortelazzo, Bologna: Zanichelli
  2. ^ a b c d e f g h i j k l m De Mauro, Tullio (ed.) (2003), Grande dizionario italiano dell'uso, CD-ROM version 2.0, Torino: UTET
  3. ^ a b c d e f g h i Nocentini, Alberto; Parenti, Alessandro (2010), l'Etimologico: vocabolario della lingua italiana, Firenze: Le Monnier
  4. ^ a b c d e f g h Wiktionary, the free dictionary, https://en.wiktionary.org
  5. ^ a b c Battisti, Carlo; Alessio, Giovanni (1950–1957), Dizionario etimologico italiano, 5 vols., Firenze: Barbèra (reprint 1975)
  6. ^ a b c d e f g h i j k Devoto, Giacomo; Oli, Gian Carlo; Serianni, Luca; Trifone, Maurizio (2026), Nuovo Devoto–Oli: il vocabolario dell'italiano contemporaneo, digital ed., Milano: Le Monnier
  7. ^ a b c d e f g Pfister, Max; Schweickard, Wolfgang; Prifti, Elton (eds.) (1979–), Lessico Etimologico Italiano, Wiesbaden: Reichert; online at lei-digitale.it, p. 1, 497
  8. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  9. ^ a b c Stammerjohann, Harro, et al. (2008), Dizionario di italianismi in francese, inglese, tedesco, Firenze: Accademia della Crusca; online at difit.italianisticaonline.it
  10. ^ a b c d e Battisti, Carlo; Alessio, Giovanni (1950–1957), Dizionario etimologico italiano, 5 vols., Firenze: Barbèra (reprint 1975), p. 357
  11. ^ a b c d e f Sabatini, Francesco; Coletti, Vittorio; Manfredini, Manuela (2026), Dizionario italiano Sabatini Coletti, digital ed., Milano: Sansoni / Rizzoli Larousse
  12. ^ a b c d e Vocabolario della lingua italiana Treccani (2011), Roma: Istituto della Enciclopedia Italiana
  13. ^ a b c d Pfister, Max; Schweickard, Wolfgang; Prifti, Elton (eds.) (1979–), Lessico Etimologico Italiano, Wiesbaden: Reichert; online at lei-digitale.it, p. 3, 377
  14. ^ a b Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter
  15. ^ a b c Tesoro della Lingua Italiana delle Origini (1997–), Opera del Vocabolario Italiano, CNR, Firenze; tlio.ovi.cnr.it

Related etymologies

  • no · also from Latin
  • cosa · also from Latin
  • a · also from Latin
  • mio · also from Latin
  • uno · also from Latin
  • si · also from Latin
  • sapere · also from Latin
  • fare · also from Latin
Cite this entry

“Atto.” Etymologically, 22 Oct. 2026, etymologically.com/it/atto. Accessed 22 Oct. 2026.

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