Etymologically

Etymology and origin of the Portuguese word união

Confidence
Established
Formation
Borrowing
First attested
1300s More words from the 14th century
Borrowed from
Latin unio
Ultimate origin
Latin ūnus
Etymology tree
inherited borrowed derived
Latin ūnus
Aromanian un
Catalan un
French un
Italian un
Italian uno
Portuguese um
Romanian un
Romanian unu
Spanish uno
Latin ūniō
French oignon
Romanian uni
French réunion
Romanian reuniune
French union
Romanian uniune
French unir
German Union
Italian unione
Italian unire
Portuguese união
Portuguese unir
Spanish unir
From the same root
Latin adūnō ← ūnus
Latin noenum ← ūnus
Latin ūllus ← ūnus
Latin ūna ← ūnus
Latin ūnanimus ← ūnus
Latin ūncia ← ūnus
Latin ūndecim ← ūnus
Latin ūndēvīgintī ← ūnus
Latin ūni- ← ūnus
Latin ūnicornis ← ūnus
Latin ūnicus ← ūnus
Latin ūnilaterālis ← ūnus
Latin ūnisonus ← ūnus
Latin ūnitās ← ūnus
Latin ūniter ← ūnus
Latin ūniversus ← ūnus
Latin ūnusquisque ← ūnus
Romanian unic ← ūnus
Italian ognuno ← uno
Italian qualcuno ← uno
Romanian niciun ← un
Romanian unealtă ← un
Romanian unul ← unu
Italian riunire ← ūniō
Latin reūniō ← ūniō
French réunir ← unir
Italian unito ← unire
Spanish reunir ← unir

Pronunciation

  • Brazil: /u.niˈɐ̃w̃/, [u.niˈɐ̃ʊ̯̃], /uˈnjɐ̃w̃/[1]
  • Portugal: /uˈnjɐ̃w̃/[1]

Forms

união f (plural uniões)[1]

Etymology

It is borrowed from Late Latin ūniō (“oneness, unity; union”), a noun formed from ūnus (“one”) with the suffix -iō.[2][3][1] Nascentes considers it a semi-learned word.[4] In Latin the abstract sense “unity, union” belongs to Christian and late writers such as Jerome; the classical noun meant a large single pearl, and a homonymous noun named a kind of onion.[5][6] The oldest Portuguese spellings are Old Galician-Portuguese huniam, Old Galician-Portuguese onyam and Old Galician-Portuguese uniom.[2][3]

The same Latin noun gave Spanish unión, recorded from Berceo, and French union.[7][1] The Latin numeral goes back to *oinos and *h₁óynos (“one, single”), with cognates such as 𐌰𐌹𐌽𐍃 (ains).[1][8]

Earliest recorded meaning

Houaiss and Cunha date the word to the 14th century, from Cunha's index of medieval Portuguese, in the spellings huniam, onyam and uniom; the 15th century has the plural unyõoes and the form hunion.[2][3] The first sense is the act of joining, junction and adhesion.[3]

Semantic evolution

Pereira (1697) glosses uniam with Latin unio and vinculum “bond”, and Bluteau defines uniaõ as the joining of different things into one, noting the theological term união hypostatica, the union of the divine and human natures in Christ.[9][10] Bluteau's book of synonyms adds concord, peace, alliance, league and friendship.[11] The original Caldas Aulete has the political sense of states with some autonomy under a central government, and Silva Bastos (1912) the traço de união, the hyphen.[12][13]

In Brazil União, with a capital, is the federal entity as distinct from the states and municipalities, and so the federal government.[14][12] Modern technical senses include the coupling that joins two pipes and the union of two sets in mathematics.[2][15] In Rio Grande do Sul the word is also used for the crossing of animals and for an unmarried partnership.[16]

Timeline

  • 14th century – first records, spelt huniam, onyam and uniom.[2][3]
  • 15th century – unyõoes and hunion.[2][3]
  • 1648 – a private letter writes uniã.[17]
  • 1697 – Pereira enters Uniam.[9]
  • 1712–1728 – Bluteau heads the word uniaõ and defines união hypostatica.[10]
  • 1813 – first records of desunião and reunião.[3]
  • 1912 – Silva Bastos lists traço de união “hyphen”.[13]

Meanings

Noun

  1. The act or result of uniting; junction, connection, contact: a união das duas peças.[2][14][15]
  2. The point where two things meet or join.[2]
  3. concord, harmony, cohesion of effort or feeling; hence the proverb a união faz a força “unity is strength”.[14][18]
  4. An alliance, pact or league.[14][19]
  5. marriage, a conjugal union, or a comparable stable partnership: união de facto.[2][18]
  6. The mating of animals.[2][14]
  7. A group of states, or of associations, under a common government or for a common purpose; a federation.[14][15]
  8. (Brazil) União: the federal entity of Brazil, as distinct from the states, and the federal government.[14][19]
  9. (Brazil) A metal coupling used to connect two pipes.[2][15]
  10. (mathematics) The union of sets: the operation, and the set it produces.[2][15]

Word family

  • desunião
  • unir
  • reunir
  • reunião
  • desunir
  • unidade
  • um
  • Latin ūnus
  • Spanish unión

References

  1. ^ a b c d e f Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. união
  3. ^ a b c d e f g Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. união
  4. ^ Nascentes, Antenor (1966), Dicionário etimológico resumido, Rio de Janeiro: Instituto Nacional do Livro, p. s.v. união
  5. ^ Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press, p. s.v. unio
  6. ^ Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press, p. s.v. unio
  7. ^ Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 5, 715
  8. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  9. ^ a b Pereira, Bento (1697), Thesouro da lingoa portuguesa, in the 1697 edition of his Prosodia (1st ed. 1647; CLP transcription, Universidade de Aveiro), p. s.v. uniam
  10. ^ 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. uniaõ
  11. ^ Bluteau, Raphael (1712–1728), Vocabulario portuguez e latino, 8 vols. + 2 supplement vols., Coimbra / Lisboa (CLP transcription, Universidade de Aveiro), p. s.v. uniam
  12. ^ 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. união
  13. ^ a b Silva Bastos, José Timóteo da (1912), Diccionario etymologico, prosodico e orthographico da lingua portugueza, Lisboa: Parceria António Maria Pereira, p. s.v. união
  14. ^ a b c d e f g Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. união
  15. ^ a b c d e 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. união
  16. ^ Schlee, Aldyr Garcia (2019), Dicionário da Cultura Pampeana Sul-Rio-Grandense, 2 vols., Pelotas: Fructos do Paiz, p. s.v. união
  17. ^ CLUL (ed.) (2014), P.S. Post Scriptum: Arquivo Digital de Escrita Quotidiana em Portugal e Espanha na Época Moderna, Lisboa: Centro de Linguística da Universidade de Lisboa, http://ps.clul.ul.pt, p. s.v. união
  18. ^ a b Porto Editora (2013), Grande Dicionário da Língua Portuguesa, Porto: Porto Editora, p. 9309
  19. ^ a b Dicionário Priberam da Língua Portuguesa, Lisboa: Priberam Informática, https://dicionario.priberam.org, p. s.v. união

Related etymologies

Cite this entry

“União.” Etymologically, 15 Nov. 2026, etymologically.com/pt/uni%C3%A3o. Accessed 16 Nov. 2026.

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