Etymologically

casus

Etymology and origin of the Latin word casus

Confidence
Established
Formation
Derivation
First attested
Plautus
Ultimate origin
Proto-Indo-European (*ḱh₂d-)
Etymology tree
inherited borrowed derived
Latin cado
Latin casus

Pronunciation

  • IPA (Classical): [ˈkaː.sʊs][1]
  • IPA (Ecclesiastical): [ˈkaː.s̬us][1]

Forms

cāsus m (genitive cāsūs); fourth declension[1]

Etymology

It is from Latin cadō (“to fall”) + -tus, from earlier cāssus.[2][1] The verb is inherited from Proto-Italic *kad-e/o-, perhaps from Proto-Indo-European *ḱh₂d- (“to fall”).[3] The grammatical sense “case” is a semantic loan from Ancient Greek πτῶσις (ptôsis, “a falling, case”).[1]

Earliest recorded meaning

De Vaan dates it from Plautus,[3] who has a character say that a fall gave great pleasure.[2] Köbler dates Plautus c. 250–184 BC.[4]

Semantic evolution

Its first sense was a fall, a downward movement of people, rain or snow.[2][5] From what “befalls” it meant chance and accident, an event or occurrence, and especially a misfortune or disaster.[2] Grammarians used it of the ending of a word and of grammatical case.[2][1] Döderlein distinguishes cāsus, chance as a natural agent, from fors, chance thought of as a kind of divine being.[6] In Cicero's time the s was written double, ⟨cassus⟩.[5]

In medieval Latin it was a legal problem in a treatise, a lawsuit, a cause and a subject.[7] It survives in Italian caso and Spanish caso, and through Old French cas English case meant “what befalls one” in the early 13th century.[1][8]

Timeline

  • c. 250–184 BC – Plautus uses it of a fall.[2][4]
  • 81–43 BC – Cicero uses it of chance and of misfortune.[2][4]
  • c. 84–c. 25 BC – Vitruvius uses it of the endings of words.[2][4]
  • early 13th century – English case “what befalls one” is recorded.[8]

Meanings

Noun

  1. A fall, downward movement.[2]
  2. (grammar) An ending; a case.[2][1]
  3. chance, accident.[2]
  4. An event, occurrence.[2]
  5. A misfortune, disaster.[2]
  6. (Medieval Latin) A legal problem; a lawsuit; a cause, ground.[7]

Word family

  • cāsuālis

Usage notes

Isidore explains the grammatical cases as named from falling, because nouns vary and “fall” through them.[9]

References

  1. ^ a b c d e f g h Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b 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 Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  5. ^ a b Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  6. ^ Döderlein, Ludwig (1874), Döderlein’s Hand-book of Latin Synonymes, tr. H. H. Arnold, Andover: W. F. Draper
  7. ^ a b Niermeyer, J. F. (1976), Mediae Latinitatis Lexicon Minus, Leiden: Brill
  8. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  9. ^ Isidore of Seville, Etymologiarum sive Originum libri XX, ed. W. M. Lindsay (Oxford, 1911).

Related etymologies

  • centum · also from Proto-Italic
  • specio · also from Proto-Italic
  • caedo · also from Proto-Italic
  • quattuor · also from Proto-Italic
  • venio · also from Proto-Italic
  • habeo · also from Proto-Italic
  • dominus · also from Proto-Italic
  • terra · also from Proto-Italic
Cite this entry

“Casus.” Etymologically, 16 Oct. 2026, etymologically.com/la/casus. Accessed 16 Oct. 2026.

Last edited on . ·