Etymologically

Etymology and origin of the Portuguese word opinião

Confidence
Established
Formation
Borrowing
First attested
1300s the plural openyões More words from the 14th century
Borrowed from
Latin opinio
Ultimate origin
Latin opinor
Etymology tree
inherited borrowed derived
Latin opīnor
Spanish opinar
Latin opīniō
English opinion
French opinion
Romanian opinie
Italian opinione
Portuguese opinião
Spanish opinión

Pronunciation

  • Brazil: /o.pi.niˈɐ̃w̃/, [o.pi.niˈɐ̃ʊ̯̃], /o.piˈnjɐ̃w̃/[1]
  • Portugal: /ɔ.piˈnjɐ̃w̃/[1]

Forms

opinião f (plural opiniões)[1] Medieval texts write openiã, openiam and the plurals openyões and opiniões in the 14th century, and oppenyom, opinioões and oupenjãos in the 15th.[2][3] A private letter of 1541 spells it opiniam.[4]

Etymology

It is borrowed from Latin opīniō (“opinion, belief, supposition”), written Old Galician-Portuguese opynion in the oldest texts.[1][2][3] Nascentes calls it semi-learned.[5]

The Latin noun is formed from opīnor (“to suppose, conjecture, deem”) with the suffix -iō.[1][6] The origin of the verb is unclear: de Vaan reports Steinbauer's proposal of a compound meaning “to try to achieve”, notes Schrijver's view that the traditional link with optō (“to choose”) is weak in meaning, and leaves it without a PIE etymology.[7]

The same Latin word gave Galician opinión, Spanish opinión, Catalan opinió, French opinion, Italian opinione and Romanian opinie.[1] The Spanish word is a learned borrowing recorded from about 1250.[8][9] The Portuguese verb opinar is a separate, later borrowing of the Latin verb, recorded only from 1688.[10][3]

Earliest recorded meaning

Houaiss and Cunha date the noun to the 14th century, from Cunha's medieval index.[2][3] Cunha's record is the plural openyões.[2][3] The sources quote no context for these records.[2] Houaiss keeps an obsolete sense “undertaking, purpose”.[2]

Semantic evolution

Barbosa's dictionary of 1611 already separates two senses, “fame, esteem” and “judgement, view”, each with Latin examples from Cicero.[11] Morais (1813) adds the vote one gives and good or bad reputation, as in homem de opinião “a man of good name”.[12] Vieira defines it as the view of someone who speaks on a question under deliberation.[13]

Modern Portuguese uses it for any personal view, a political or religious position, an unproven assumption and the shared view of a community, as in opinião pública “public opinion”.[2][14] Philosophy uses it for unexamined common belief as opposed to knowledge.[2] Informally it can mean stubbornness or vanity, and regional surveys record “stubbornness” in Brazil, “presumption” in Portugal and “goodwill” in the Azores.[2][15]

Timeline

  • 14th century – first records, including the plural openyões.[2][3]
  • 15th century – spellings oppenyom and opinioões.[2]
  • 1541 – opiniam in a private letter.[4]
  • 1611 – Barbosa gives the senses “fame, esteem” and “judgement”.[11]
  • 1688 – first record of the verb opinar.[10]
  • 1697 – Pereira glosses it with Latin opinio and opinatio.[16]
  • 1813 – Morais records homem de opinião.[12]

Meanings

Noun

  1. A way of thinking or judging; the view one holds on a question; opinion: Ela mudou de opinião depois da reunião.[2][17][1]
  2. A judgement given after reflection or deliberation; a vote.[2][18]
  3. A position held in a particular field, such as politics or religion; a doctrine.[2][17]
  4. An idea that has not been checked; an unfounded presumption.[2][14]
  5. The esteem in which someone or something is held; reputation.[2][18]
  6. The shared view of a group or community on a subject;[2][19] opinião pública “public opinion”.[2][19]
  7. (philosophy) Common belief accepted without examination, as opposed to knowledge.[2]
  8. (informal) stubbornness, obstinacy; also an excessive good opinion of oneself, vanity.[2][15]

Word family

  • opinioso

References

  1. ^ a b c d e f g Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n o p q r s t Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. opinião
  3. ^ a b c d e f Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. opinar
  4. ^ a b 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. opinião
  5. ^ Nascentes, Antenor (1966), Dicionário etimológico resumido, Rio de Janeiro: Instituto Nacional do Livro, p. s.v. opinião
  6. ^ Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press, p. s.v. opīniō
  7. ^ 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. opīnor
  8. ^ Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 4, 287
  9. ^ Corominas, Joan (1973), Breve diccionario etimológico de la lengua castellana, 3rd ed., Madrid: Gredos, p. s.v. opinión
  10. ^ a b Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. opinar
  11. ^ a b Barbosa, Agostinho (1611), Dictionarium lusitanicolatinum, Braga: Fructuoso Lourenço de Basto (CLP transcription, Universidade de Aveiro), p. s.v. opinião
  12. ^ a b Silva, António de Morais (1813), Diccionario da lingua portugueza, 2nd ed., 2 vols., Lisboa: Typographia Lacerdina, p. 2, 367
  13. ^ Vieira, Frei Domingos (1871–1874), Grande Diccionario Portuguez ou Thesouro da lingua portugueza, 5 vols., Porto: Ernesto Chardron e Bartholomeu H. de Moraes, p. 4, 558
  14. ^ 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. opinião
  15. ^ a b 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. opinião
  16. ^ 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. opinião
  17. ^ a b Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. opinião
  18. ^ 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. opinião
  19. ^ a b Dicionário Priberam da Língua Portuguesa, Lisboa: Priberam Informática, https://dicionario.priberam.org, p. s.v. opinião

Related etymologies

Cite this entry

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

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