Etymologically

Etymology and origin of the Spanish word caso

Confidence
Established
Formation
Borrowing
First attested
1218–1250 Fuero de Zorita de los Canes More words from the 13th century
Borrowed from
Latin casus
Ultimate origin
Proto-Indo-European *ḱh₂d-
Etymology tree
inherited borrowed derived
Latin cadō
Latin cāsus
French cas
Italian caso
Spanish caso
From the same root
Latin accidō ← cadō
Latin cadāver ← cadō
Latin cadūcus ← cadō
Latin concidō ← cadō
Latin dēcidō ← cadō
Latin excidō ← cadō
Latin incidō ← cadō
Latin intercidō ← cadō
Latin occidō ← cadō
Latin prōcidō ← cadō
Latin recidō ← cadō
Latin stillicidium ← cadō
Latin succidō ← cadō
Latin cāsuālis ← cāsus

Pronunciation

  • /ˈkaso/, [ˈka.so][1]

Forms

caso m (plural casos)[1]

Etymology

It is borrowed from Latin cāsus (“fall; chance, accident; grammatical case”), a learned word.[2][3][4][1] The Latin noun is formed from cadō (“to fall, happen”), the source of caer, with the suffix -tus; the older form cāssus lost its double ⟨ss⟩ after the long vowel.[5][1] The verb goes back to Proto-Indo-European *ḱh₂d- (“to fall”).[1]

The grammatical sense of the Latin word translates Ancient Greek πτῶσις (ptôsis, “fall; grammatical case”).[1][6] The same Latin word is Portuguese caso, Galician caso, Catalan cas, Occitan cas, French cas and Italian caso.[1][7] In the 15th and 16th centuries the ⟨s⟩ of the word was voiced, /z/.[2]

Earliest recorded meaning

Corominas dated the word to Santillana at the beginning of the 15th century, but the CDH has it two centuries earlier.[2][8] In the Fuero of Zorita de los Canes (1218–c. 1250) it is a legal case or circumstance: „en aqueste caso mando que el sennor dela rayz non aya del fructo ninguna cosa” “in this case I order that the owner of the land have none of the fruit”.[8]

Semantic evolution

In Alfonso X's prose a caso is a situation or set of circumstances.[9] Juan Ruiz uses the plural for causes and lawsuits.[10] In the 15th century it also meant “event” and “chance”, as in Nebrija's casus, fortuna.[11][12]

Covarrubias in 1611 gave the jurists' caso, the case on which a law decides, and the grammarians' cases, and the phrases no hacer al caso “to be beside the point” and demos caso “let us suppose”.[13] The Autoridades added “occasion, juncture”.[14] The Academy's dictionary of 1884 has the medical sense, each individual instance of an epidemic disease.[15] The DLE now adds the notorious affair that draws public interest and the matter a police force or a court deals with.[4] In several countries of South America a caso is also a popular tale told as an example.[4][16]

Timeline

  • 1218–c. 1250 – the Fuero of Zorita de los Canes, the first record without a later copy.[8]
  • 1256–1300 – Alfonso X's prose uses caso for “circumstance”.[9]
  • 1330–1343 – Juan Ruiz's Libro de buen amor uses the plural for lawsuits.[10]
  • early 15th century – Santillana, the first record for Corominas.[2][3]
  • c. 1440 – first record of acaso.[3]
  • c. 1495 – Nebrija gives Latin casus, fortuna and fors.[12]
  • 1611 – Covarrubias records no hacer al caso and demos caso.[13]
  • 1884 – the Academy's dictionary adds the medical sense.[15]

Meanings

Noun

  1. An event, something that happens.[4][1]
  2. chance.[4]
  3. An occasion or circumstance: En ese caso, me quedo en casa.[4][1]
  4. A matter put to someone for an opinion.[4]
  5. (medicine) An individual instance of a disease, especially an epidemic one.[4][1]
  6. A notorious or criminal affair that draws public curiosity.[4]
  7. (law) A matter investigated by the police or tried in court.[4][1]
  8. (grammar) case: the category that marks syntactic relations by inflection, and the function it marks.[4][1]
  9. (Latin America) A popular tale, true or invented, told as an example.[4][16]

Word family

  • acaso

Usage notes

Set phrases include caso fortuito “accident, act of God”, caso de conciencia “a point of conscience” and caso perdido “a hopeless case”.[4] An obsolete legal adjective caso “null, void” is a different word, from Latin cassus.[15][11]

References

  1. ^ a b c d e f g h i j k l Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 1, 909
  3. ^ a b c Corominas, Joan (1973), Breve diccionario etimológico de la lengua castellana, 3rd ed., Madrid: Gredos, p. s.v. caso
  4. ^ a b c d e f g h i j k l m Real Academia Española; Asociación de Academias de la Lengua Española (2014–), Diccionario de la lengua española, 23rd ed., online version 23.8, https://dle.rae.es, p. s.v. caso
  5. ^ Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  6. ^ Gómez de Silva, Guido (1988), Breve diccionario etimológico de la lengua española, México: Fondo de Cultura Económica / El Colegio de México, p. 158
  7. ^ Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. 748
  8. ^ a b c Real Academia Española (2013–), Corpus del Diccionario histórico de la lengua española (CDH), version 3.1, https://apps.rae.es/CNDHE, p. s.v. caso
  9. ^ a b Kasten, Lloyd A.; Nitti, John J.; Gago Jover, Francisco (2002–), Diccionario de la prosa castellana del Rey Alfonso X, New York: Hispanic Seminary of Medieval Studies (electronic edition 2024), p. s.v. caso
  10. ^ a b Boggs, R. S.; Kasten, Lloyd; Keniston, Hayward; Richardson, H. B. (1946), Tentative Dictionary of Medieval Spanish, 2 vols., Chapel Hill, N.C., p. 103
  11. ^ a b Alonso Pedraz, Martín (1986), Diccionario medieval español: desde las Glosas Emilianenses y Silenses (s. X) hasta el siglo XV, 2 vols., Salamanca: Universidad Pontificia de Salamanca, p. 643
  12. ^ a b Nebrija, Antonio de (1513), Vocabulario español-latino, Salamanca, ed. Marina Vidal Díez (2007), Biblioteca Virtual Miguel de Cervantes, p. 312
  13. ^ a b Covarrubias Orozco, Sebastián de (1611), Tesoro de la lengua castellana o española, Madrid: Luis Sánchez (Biblioteca Wordkers transcription, CC BY 4.0), p. 454
  14. ^ Real Academia Española (1726–1739), Diccionario de la lengua castellana (Diccionario de Autoridades), 6 vols., Madrid: Francisco del Hierro, p. 2, 216
  15. ^ a b c Real Academia Española (1884), Diccionario de la lengua castellana, 12th ed., Madrid: Imprenta de D. Gregorio Hernando (the first Academy edition with etymologies), p. 223
  16. ^ a b Asociación de Academias de la Lengua Española (2010), Diccionario de americanismos, Lima: Santillana; online at https://www.asale.org/damer, p. s.v. caso

Related etymologies

Cite this entry

“Caso.” Etymologically, 7 Nov. 2026, etymologically.com/es/caso. Accessed 7 Nov. 2026.

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