Etymologically

Etymology and origin of the Portuguese word jurar

Confidence
Established
Formation
Inherited
First attested
1200s the cantigas More words from the 13th century
Inherited from
Latin juro
Ultimate origin
Latin jūs

Pronunciation

  • Brazil: /ʒuˈɾa(ʁ)/, [ʒuˈɾa(h)][1]
  • São-Paulo: /ʒuˈɾa(ɾ)/[1]
  • Rio-de-Janeiro: /ʒuˈɾa(ʁ)/, [ʒuˈɾa(χ)][1]
  • Caipira: /ʒuˈɾa(ɻ)/[1]

Forms

jurar (first-person singular present juro, first-person singular preterite jurei, past participle jurado)[1] Houaiss records iurar (1152), jurauõ (14th century) and jurarom (1392) among the medieval forms.[2]

Etymology

It is inherited from Latin jūrō (“to swear, take an oath”), written Old Galician-Portuguese jurar in the oldest texts.[2][3][4][1] The Latin verb is formed on jūs in its old sense of a ritual formula with the force of law.[5][6] Wiktionary traces it ultimately to Proto-Indo-European *h₂yew-.[1]

The same Latin verb is Galician xurar, Spanish jurar, Catalan jurar, French jurer, Italian giurare and Romanian jura.[7][1]

Earliest recorded meaning

Houaiss's first date, 1152, comes from Machado's records.[2] Cunha dates the word to the 13th century.[3] In the cantigas it is the swearing of an oath: Afonso X writes juro par Deus lo santo / que manto / non tragerei “I swear by holy God that I will wear no cloak”, and the Crónica Troiana has uos juro parlos deuses “I swear to you by the gods”.[8]

Semantic evolution

The medieval lyric already has set phrases: jurar a finas e a fio “to swear firmly, without hesitation” in a cantiga of Afonso X.[8] Bluteau (1712–1728) defines the verb as affirming or denying with an oath and lists jurar falso “to swear falsely”.[9] Morais (1789) records jurar alguém por seu Rei “to acknowledge someone as king by oath and bind oneself to obey him”.[10] The sense “to curse, utter oaths” is in Houaiss, Priberam and Schlee's dictionary of Rio Grande do Sul.[2][11][12]

Timeline

  • 1152 – iurar, the first date Houaiss gives.[2]
  • 13th century – the cantigas of the Cancioneiro da Ajuda and of Afonso X.[8][3]
  • 1393 – the spelling jurar.[2]
  • c. 1430 – the Horto do Esposo (copied 1390–1437) uses the word.[13]
  • 1712 – Bluteau lists jurar falso.[9]
  • 1789 – Morais records jurar alguém por seu Rei.[10]

Meanings

Verb

  1. To swear, to declare or promise under oath: Jurou que tinha dito a verdade.[2][14][1]
  2. (intransitive) To take an oath: jurar sobre os Evangelhos.[2][11]
  3. To assert firmly, to assure: Juro que não fui eu.[2][14]
  4. To declare publicly (love, hatred, loyalty): jurar fidelidade.[2]
  5. jurar em To trust completely in (what someone says).[2]
  6. To recognise by oath: jurar alguém por rei.[2][10]
  7. To invoke (a sacred name): jurar o nome de Deus em vão.[2][14]
  8. To curse, to utter imprecations.[2][11][12]

Word family

Usage notes

A dialect survey of 1974 records jurar “to earn interest” in Portugal.[15]

References

  1. ^ a b c d e f g h i Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. jurar
  3. ^ a b c Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. jurar
  4. ^ Nascentes, Antenor (1966), Dicionário etimológico resumido, Rio de Janeiro: Instituto Nacional do Livro, p. s.v. jurar
  5. ^ Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press, p. s.v. iūrō
  6. ^ Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  7. ^ Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter
  8. ^ a b c Instituto da Lingua Galega, Dicionario de dicionarios do galego medieval (DDGM), ed. Ernesto González Seoane, Santiago de Compostela: Universidade de Santiago de Compostela, https://ilg.usc.gal/ddgm, p. s.v. jurar
  9. ^ a b Bluteau, Raphael (1712–1728), Vocabulario portuguez e latino, 8 vols. + 2 supplement vols., Coimbra / Lisboa (CLP transcription, Universidade de Aveiro), p. s.v. jurar
  10. ^ a b c Silva, António de Morais (1789), Diccionario da lingua portugueza composto pelo padre D. Rafael Bluteau, reformado, e accrescentado, 2 vols., Lisboa: Simão Thaddeo Ferreira, p. 1, 748
  11. ^ a b c Dicionário Priberam da Língua Portuguesa, Lisboa: Priberam Informática, https://dicionario.priberam.org, p. s.v. jurar
  12. ^ a b Schlee, Aldyr Garcia (2019), Dicionário da Cultura Pampeana Sul-Rio-Grandense, 2 vols., Pelotas: Fructos do Paiz, p. s.v. jurar
  13. ^ Centro de Linguística da Universidade de Lisboa, CTA – Corpus de Textos Antigos, https://teitok.clul.ul.pt/cta, p. s.v. jurar
  14. ^ a b c Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. jurar
  15. ^ Instituto da Lingua Galega, Tesouro do léxico patrimonial galego e portugués (TLPGP), Santiago de Compostela: Universidade de Santiago de Compostela, https://ilg.usc.gal/tesouro, p. s.v. jurar

Related etymologies

Cite this entry

“Jurar.” Etymologically, 15 Nov. 2026, etymologically.com/pt/jurar. Accessed 16 Nov. 2026.

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