Etymologically

Etymology and origin of the Portuguese word seis

Confidence
Established
Formation
Inherited
First attested
1249 More words from the 13th century
Inherited from
Latin sex
Ultimate origin
Proto-Indo-European *swéḱs
Etymology tree
inherited borrowed derived
Latin sex
French six
Italian sei
Portuguese seis
Romanian șase
Spanish seis
From the same root
Latin sēdecim ← sex
Latin sēmēstris ← sex
Latin senus ← sex
Latin sexāgintā ← sex

Pronunciation

  • Brazil: /ˈsejs/, [ˈseɪ̯s][1]
  • Rio-de-Janeiro: /ˈsejʃ/, [ˈseɪ̯ʃ][1]
  • Portugal: /ˈsɐjʃ/[1]
  • Northern, Portugal: /ˈsejʃ/[1]

Forms

seis m or f[1] Old Galician-Portuguese also wrote seys and the Latinising sex, and Houaiss records sseys in the 14th century.[2][3][1]

Etymology

It is inherited from Latin sex (“six”), written Old Galician-Portuguese seis and Old Galician-Portuguese seys in the oldest texts.[3][2][1] Latin pronounced the word /seks/; in Portuguese the velar /k/ of the group /ks/ was vocalised to the glide /j/, which gives the diphthong /ej/ of the modern word.[3]

The same Latin word is Galician seis, Spanish seis, Catalan sis, French six, Italian sei and Romanian șase.[1][4][5]

The Latin word goes back to *seks, from *swéḱs.[6][1] Its cognates include ἕξ (héx), षष् (ṣaṣ) and the English word six.[1] De Vaan writes the reconstruction with the initial /s/ in brackets, since some languages point to a form beginning /sw-/ and others to one beginning /w-/.[6][5]

Earliest recorded meaning

Houaiss dates the word to 1249, from a text in the collection of old laws he cites as Leges.[3] In the Cantigas de Santa Maria of the second half of the 13th century a miracle happens a cabo de seis dias “after six days”, and the Galician Crónica Troiana speaks of the six ages of the world (as seis ydades).[7]

Semantic evolution

The numeral has kept its meaning; what grew was its use as a noun.[3] Bluteau (1712–1728) still glosses it only as the Latin numeral, with compounds such as seiscentos “six hundred” and seis mil.[8] The original Caldas Aulete adds the noun: the digit 6, and the card, die face or domino tile with six spots, noting that as a noun it can be used in the plural.[9] Modern dictionaries also use it for the sixth item of a series and for a mark of six in an examination.[3][10]

The word passed into the Portuguese-based creoles: sais in Kabuverdianu, sês in Macanese and seis in Papiamentu.[1]

Timeline

  • 1249 – Houaiss's first record, from the Leges.[3]
  • 13th century – seis in the Cantigas de Santa Maria;[7][2] Cunha also records sex in this century.[7][2]
  • 14th century – the spellings seys and sseys.[2][3]
  • c. 1430 – seis in the Horto do Esposo (copied 1390–1437).[11]
  • 1569 – Cardoso's Portuguese–Latin dictionary renders Seis by Latin sex.[12]
  • 1712–1728 – Bluteau lists seiscentos, seis mil and seis vezes.[8]
  • 1881 – the original Caldas Aulete gives the noun senses of the digit and of the card or die face.[9]

Meanings

Numeral

  1. six, five plus one: Comprou seis laranjas.[3][13][1]
  2. sixth, after a noun, the sixth of a series: a página seis.[3][14]

Noun

  1. The number six, and the digit 6.[3][15][1]
  2. A playing card, die face or domino tile with six spots: o seis de copas.[10][13]
  3. A mark of six in an examination or assessment.[10]

Word family

  • seisavo
  • seiscentos
  • sexto
  • sexta
  • sexagésimo
  • sexteto
  • Latin sex
  • Galician seis

References

  1. ^ a b c d e f g h i j k l m Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. seis
  3. ^ a b c d e f g h i j k Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. seis
  4. ^ Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 5, 192
  5. ^ a b Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert, p. s.v. six
  6. ^ a b 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. sex
  7. ^ 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. seis
  8. ^ 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. seis
  9. ^ 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. seis
  10. ^ a b c Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. seis
  11. ^ Centro de Linguística da Universidade de Lisboa, CTA – Corpus de Textos Antigos, https://teitok.clul.ul.pt/cta, p. s.v. seis
  12. ^ Cardoso, Jerónimo (1569–1570), Dictionarium ex lusitanico in latinum sermonem, Lisboa: João Álvares (CLP transcription, Universidade de Aveiro), p. s.v. seis
  13. ^ a b Academia das Ciências de Lisboa, Dicionário da Língua Portuguesa, revised online edition (2023–) of the Dicionário da Língua Portuguesa Contemporânea (2001), https://dicionario.acad-ciencias.pt, p. s.v. seis
  14. ^ Dicionário Priberam da Língua Portuguesa, Lisboa: Priberam Informática, https://dicionario.priberam.org, p. s.v. seis
  15. ^ Porto Editora (2013), Grande Dicionário da Língua Portuguesa, Porto: Porto Editora, p. 8370

Related etymologies

Cite this entry

“Seis.” Etymologically, 15 Nov. 2026, etymologically.com/pt/seis. Accessed 16 Nov. 2026.

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