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
From the same root
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
- just, fair: acting according to justice and reason; also as a noun.[6][1]
- In accordance with justice and reason: una decisión justa del árbitro.[6][18]
- righteous: living according to God's law; also as a noun, los justos.[6]
- exact: having neither more nor less than it should in number, weight or measure.[6]
- tight, fitting closely: Estos zapatos me quedan justos.[6]
Adverb
Word family
- justillo
- ajustar
- injusto
- justedad
Related words
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
- ^ a b c d e f g h i Wiktionary, the free dictionary, https://en.wiktionary.org
- ^ a b Diccionario del Español Medieval electrónico (DEMel), data publication 2026 (CC BY-SA), Universität Rostock, p. s.v. justo
- ^ 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
- ^ 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
- ^ a b c Corominas, Joan (1973), Breve diccionario etimológico de la lengua castellana, 3rd ed., Madrid: Gredos, p. s.v. justo
- ^ 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
- ^ García de Diego, Vicente (1985), Diccionario etimológico español e hispánico, 2nd ed., Madrid: Espasa-Calpe (1st ed. 1954), p. s.v. justus
- ^ Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter, p. s.v. justus
- ^ a b Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press, p. s.v. iustus
- ^ 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
- ^ 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
- ^ a b Real Academia Española (1726–1739), Diccionario de la lengua castellana (Diccionario de Autoridades), 6 vols., Madrid: Francisco del Hierro, p. 4, 337
- ^ 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
- ^ 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
- ^ Battaner Arias, Paz (dir.) (2017), Diccionario general de la lengua española VOX, Barcelona: Larousse Editorial, p. s.v. justo
- ^ 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
- ^ 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
- ^ 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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