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Etymology and origin of the Portuguese word dia

Confidence
Established
Formation
Inherited
First attested
1214 More words from the 13th century
Inherited from
Latin *dia
Ultimate origin
Proto-Indo-European *dyḗws
Derivations

Pronunciation

  • Brazil: /ˈd͡ʒi.ɐ/[1]
  • Portugal: /ˈdi.ɐ/[1]
  • Northeast-Brazil: /ˈdi.ɐ/[1]

Forms

dia m (plural dias, diminutive diazinho)[1] Houaiss records dia and dya in the 13th century and dija in 1292.[2]

Etymology

It is inherited from Vulgar Latin *dia (“day”), written Old Galician-Portuguese dia in the oldest texts, a reshaping of the classical Latin diēs (“day”).[2][3][4][1] Nascentes explains that some nouns of the Latin fifth declension had variants in the first, and that the Latin word was masculine or feminine in the singular and always masculine in the plural, so the Portuguese word kept the masculine gender.[4]

The form in -a prevailed in Portuguese, Spanish, Catalan and Occitan, Galician día, Spanish día, Catalan dia, Occitan dia; the other Romance languages continue the classical form, as Italian dì, Romanian zi and the French midi “midday”.[5][6][1]

The Latin word was formed anew from its accusative, from *djēm, the accusative of *djous (“day, sky”), from *dyḗws (“heaven, sky”).[1] De Vaan derives it from the Proto-Indo-European name of the god of the clear sky, the same word as Ζεύς (Zeús) and the first part of the Latin name of Jupiter.[7][8]

Earliest recorded meaning

Houaiss dates the word to 1214, from Cunha's medieval index.[2] In the Cancioneiro da Ajuda it already means both “a period of 24 hours” and “the time between sunrise and sunset”, as in Pero Garcia Burgales's mil vezes no dia “a thousand times a day”.[9]

Semantic evolution

The cantigas d'amigo have many set phrases: oj' este dia “today”, grave dia and mal dia “an evil day, misfortune”, bon dia “happiness”, and bon dia nacer “to be born on a good day, be lucky”.[9][10] Barbosa (1611) lists dia sancto “holy day”, dia de fazer “working day” and dia azinhago “ill-omened day”, and Folqman (1755) the greeting bons dias.[11][12] Bluteau (1712) still repeats the old guesses that the word came from Greek dyas “two” or from the Latin word for the gods.[13]

Morais (1813) distinguishes the dia natural of 24 hours from the dia artificial of daylight, and records the plural dias for a person's lifetime or reign.[14] Modern senses include the weather of a day, the hours of a working day and a day's wage.[15][16] Cunha dates the derivatives of adiar “to postpone” from the 19th century: adiamento 1873, adiável 1899.[3] The word passed into Kabuverdianu, Guinea-Bissau Creole and Macanese as dia.[1]

Timeline

  • 1214 – first record.[2]
  • 1292 – the spelling dija.[2]
  • 13th century – dia do joyzo “Judgement Day”.[2]
  • c. 1400 – a fragment of the Flos Sanctorum of Santiago de Compostela is the first text of the CTA corpus with the word.[17]
  • 1611 – Barbosa lists dia sancto, dia de fazer and dia azinhago.[11]
  • 1712 – Bluteau discusses the origin of the word.[13]
  • 1813 – Morais distinguishes dia natural and dia artificial.[14]
  • 1873 – first record of adiamento.[3]

Meanings

Noun

  1. day, daytime: the time between sunrise and sunset, as opposed to night.[2][15][1]
  2. daylight, the light of the sun.[2][15]
  3. A period of 24 hours; the time the Earth takes to turn once on its axis, a unit of time.[2][16][1]
  4. A date of the calendar, from midnight to midnight: no dia 25 de abril.[18][19][1]
  5. The weather of a day: Está um dia chuvoso.[15][16]
  6. A working day; a day's pay.[15][16][20]
  7. The right moment, the occasion: Hoje não é o meu dia.[20][19]
  8. (in the plural) One's life; a period, an age: nos nossos dias.[16][1]

Word family

  • adiar
  • adiamento
  • adiável
  • inadiável
  • meio-dia
  • diário
  • diurno
  • jeira
  • jorna
  • jornada
  • jornal
  • diária
  • Latin diēs
  • Galician día

Usage notes

Common phrases are bom dia “good morning”, dia a dia “day by day”, em dia “up to date” and hoje em dia “nowadays”.[16][18]

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 e f g h i Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. dia
  3. ^ a b c Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. dia
  4. ^ a b Nascentes, Antenor (1966), Dicionário etimológico resumido, Rio de Janeiro: Instituto Nacional do Livro, p. s.v. dia
  5. ^ Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 2, 486
  6. ^ Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter, p. s.v. diēs
  7. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  8. ^ Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  9. ^ a b 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. dia
  10. ^ Universo Cantigas: Glosario da poesía medieval profana galego-portuguesa, A Coruña: Instituto da Lingua e Literatura (ILLA), Universidade da Coruña, https://www.universocantigas.gal, p. s.v. dia
  11. ^ a b Barbosa, Agostinho (1611), Dictionarium lusitanicolatinum, Braga: Fructuoso Lourenço de Basto (CLP transcription, Universidade de Aveiro), p. s.v. dia
  12. ^ Folqman, Carlos (1755), Diccionario portuguez, e latino, Lisboa: Régia Officina Silviana (CLP transcription, Universidade de Aveiro), p. s.v. dia
  13. ^ 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. dia
  14. ^ a b Silva, António de Morais (1813), Diccionario da lingua portugueza, 2nd ed., 2 vols., Lisboa: Typographia Lacerdina, p. 1, 612
  15. ^ a b c d e Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. dia
  16. ^ a b c d e f Porto Editora (2013), Grande Dicionário da Língua Portuguesa, Porto: Porto Editora, p. 3115
  17. ^ Centro de Linguística da Universidade de Lisboa, CTA – Corpus de Textos Antigos, https://teitok.clul.ul.pt/cta, p. s.v. dia
  18. ^ a b Dicionário Priberam da Língua Portuguesa, Lisboa: Priberam Informática, https://dicionario.priberam.org, p. s.v. dia
  19. ^ a b Aulete, Francisco Júlio Caldas, Dicionário contemporâneo da língua portuguesa (1st ed. 1881), online as Aulete Digital, Rio de Janeiro: Lexikon, https://aulete.com.br, p. s.v. dia
  20. ^ a b Michaelis: Moderno Dicionário da Língua Portuguesa, São Paulo: Melhoramentos (online as Michaelis Dicionário Brasileiro da Língua Portuguesa, https://michaelis.uol.com.br), p. s.v. dia

Related etymologies

Cite this entry

“Dia.” Etymologically, 15 Nov. 2026, etymologically.com/pt/dia. Accessed 16 Nov. 2026.

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