Etymologically

Etymology and origin of the Spanish word justo

Confidence
Established
Formation
Inherited
First attested
c. 1140 Cantar de mio Cid More words from the 12th century
Inherited from
Latin iustus via Old Spanish
Ultimate origin
Latin iūs
Etymology tree
inherited borrowed derived
Latin iūs
Latin iūstus
Italian giusto
Spanish justo
English just
French juste
From the same root
Latin iniūriā ← iūs
Latin iūdex ← iūs
Latin iure ← iūs
Latin iūrgō ← iūs
Latin iūriscōnsultus ← iūs
Latin iūrisdictiō ← iūs
Latin iūrō ← iūs
Latin iūsiūrandum ← iūs
Latin iūstitium ← iūs
Latin periūrus ← iūs
Dutch juist ← iūstus
Latin iniūstus ← iūstus
Latin iuste ← iūstus
Latin iūstificō ← iūstus
Latin iūstitia ← iūstus
English unjust ← just
French justement ← juste

Pronunciation

  • /ˈxusto/, [ˈxus.t̪o][1]

Forms

justo (feminine justa, masculine plural justos, feminine plural justas, superlative justísimo)[1] Old Spanish texts also write iusto.[2][3]

Etymology

It is inherited from Old Spanish justo, inherited from Latin iūstus (“just, lawful”).[4][5][6][1] Corominas sees no decisive reason to call it a learned word in any Romance language except French juste, and even there the old form just may be inherited.[4]

The same word is Portuguese justo, Galician xusto, Asturian xustu, Aragonese chusto, Catalan just and Italian giusto.[7][8][1]

The Latin adjective is formed from iūs (“law, right”).[9][10] Old Latin had the form iouestod, an ablative on the Forum inscription.[9][10] De Vaan reconstructs Proto-Italic *jowesto- (“just”), from the stem of a word meaning “vital force, eternity”.[10][1] Wiktionary gives the root as Proto-Indo-European *h₂yew-.[10][1]

Earliest recorded meaning

The DCECH and the BDELC date the word from the Cantar de mio Cid and Berceo.[4][5] Alfonso X's prose has its moral and religious senses: God is called justo claro & derechurero “just, bright and upright”, and the iustos are opposed to sinners.[3]

Semantic evolution

Besides “acting justly” and “righteous before God”, Covarrubias records the sense “exact in weight or measure” and vestido justo, a tight-fitting garment.[11] The Diccionario de Autoridades gives the senses “equal, exact” and “tight, leaving no gap”, both with lines of Quevedo.[12] In the slang of the germanía, justo was a doublet, the garment.[13][14]

The Academy's 1884 dictionary gives the adverb “justly; tightly”.[14] Today the adverb is common for “exactly, just”, as in justo cuando “just when”, and in music justo describes a perfect interval.[15] In the Canaries, a 1497 synod mentions the justo, a Portuguese gold coin of John II.[16]

Timeline

  • c. 1140 – first record, in the Cantar de mio Cid.[4][5][2]
  • 1256 – Alfonso X's Picatrix calls God justo.[3]
  • 1480 – first record of injustamente.[4]
  • 1505 – first record in the Americas, in Tierra Firme: a justo o ynjusto.[17]
  • 1609 – Hidalgo's germanía vocabulary has justo “doublet”.[13]
  • 1611 – Covarrubias gives the sense “exact, tight-fitting” and the phrase en justo y creyente “at once”.[11]
  • 1734 – the Diccionario de Autoridades defines it with quotations of Quevedo.[12]
  • 1884 – the Academy gives the etymology “Del lat. iustus” and the adverb.[14]

Meanings

Adjective

  1. just, fair: acting according to justice and reason; also as a noun.[6][1]
  2. In accordance with justice and reason: una decisión justa del árbitro.[6][18]
  3. righteous: living according to God's law; also as a noun, los justos.[6]
  4. exact: having neither more nor less than it should in number, weight or measure.[6]
  5. tight, fitting closely: Estos zapatos me quedan justos.[6]

Adverb

  1. exactly, just: Llegó justo a tiempo.[6][1]
  2. tightly, closely.[6][1]

Word family

  • justillo
  • ajustar
  • injusto
  • justedad

Usage notes

Al justo means “exactly, in due proportion”.[6] The proverb pagan justos por pecadores “the righteous pay for the sinners” is in Covarrubias.[11]

References

  1. ^ a b c d e f g h i Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b Diccionario del Español Medieval electrónico (DEMel), data publication 2026 (CC BY-SA), Universität Rostock, p. s.v. justo
  3. ^ a b c 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. justo
  4. ^ a b c d e Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 3, 542
  5. ^ a b c Corominas, Joan (1973), Breve diccionario etimológico de la lengua castellana, 3rd ed., Madrid: Gredos, p. s.v. justo
  6. ^ a b c d e f g h i 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. justo
  7. ^ García de Diego, Vicente (1985), Diccionario etimológico español e hispánico, 2nd ed., Madrid: Espasa-Calpe (1st ed. 1954), p. s.v. justus
  8. ^ Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter, p. s.v. justus
  9. ^ a b Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press, p. s.v. iustus
  10. ^ a b c d de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill, p. s.v. iūs
  11. ^ a b c Covarrubias Orozco, Sebastián de (1611), Tesoro de la lengua castellana o española, Madrid: Luis Sánchez (Biblioteca Wordkers transcription, CC BY 4.0), p. 1028
  12. ^ a b Real Academia Española (1726–1739), Diccionario de la lengua castellana (Diccionario de Autoridades), 6 vols., Madrid: Francisco del Hierro, p. 4, 337
  13. ^ a b Hidalgo, Juan (1609), Romances de germanía de varios autores, con el vocabulario por la orden del a.b.c. para declaración de sus términos y lengua, Barcelona: Sebastián de Cormellas (ed. Madrid 1779), p. 183
  14. ^ 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. 622
  15. ^ Battaner Arias, Paz (dir.) (2017), Diccionario general de la lengua española VOX, Barcelona: Larousse Editorial, p. s.v. justo
  16. ^ Real Academia Española (2021–), Tesoro de los diccionarios históricos de la lengua española (TDHLE): Diccionario histórico (1933–1936), its unpublished slips, Diccionario histórico (1960–1996), DHECan, DHECR, DHEVen, https://www.rae.es/tdhle, p. s.v. justo
  17. ^ Boyd-Bowman, Peter (2003), Léxico hispanoamericano 1493–1993, ed. Ray Harris-Northall and John J. Nitti, New York: Hispanic Seminary of Medieval Studies, p. s.v. justo
  18. ^ Moliner, María (2007), Diccionario de uso del español, 3rd ed., Madrid: Gredos, p. s.v. justo

Related etymologies

Cite this entry

“Justo.” Etymologically, 7 Nov. 2026, etymologically.com/es/justo. Accessed 7 Nov. 2026.

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