Etymologically

Etymology and origin of the Portuguese word interesse

Confidence
Established
Formation
Borrowing
First attested
1400s More words from the 15th century
Borrowed from
Latin intersum
Ultimate origin
Latin intersum
Etymology tree
inherited borrowed derived
Proto-Indo-European *h₁es-
Latin sum
Aromanian hiu
Catalan son
French soit
Italian essere
Romanian fi
Spanish ser
Latin intersum
German Interesse
Italian interesse
Romanian interes
Portuguese interesse
Spanish interés
The word's journey
From the same root
Proto-Germanic *sunjō ← *h₁es-
Latin absum ← sum
Latin adsum ← sum
Latin dēsum ← sum
Latin ēns ← sum
Latin forsit ← sum
Latin forsitan ← sum
Latin futūrus ← sum
Latin īnsum ← sum
Latin obsum ← sum
Latin possum ← sum
Latin praesum ← sum
Latin prōsum ← sum
Latin subsum ← sum
Latin supersum ← sum
Romanian ființă ← fi
Romanian fire ← fi
German interessieren ← Interesse
Italian interessare ← interesse
Spanish interesar ← interés

Pronunciation

  • Brazil: /ĩ.teˈɾe.si/[1]
  • Portugal: /ĩ.tɨˈɾe.sɨ/, /ĩˈtɾe.sɨ/, /ẽ.tɨˈɾe.sɨ/[1]

Forms

interesse m (plural interesses)[1] Fifteenth-century texts spell it jnteresse, interese and ynterese.[2] A letter of 1538 has ymterese.[3]

Etymology

It is borrowed from Medieval Latin interesse (“compensation; interest on money”), the infinitive of the classical verb “to be between; to matter, concern” used as a noun.[4][2][1] Houaiss starts from the impersonal use of the verb, “it matters, it is in someone's interest”.[2] The verb is made of inter- (“between”) and sum (“to be”).[5][1]

Nascentes notes that the infinitive was used as a noun from the 13th century and came into Portuguese by the learned route.[6] In medieval Latin it meant the damages owed for breaking a contract, and the interest on a capital.[7][8] Bluteau, in the 18th century, already derived it from the Latin impersonal verb in phrases meaning “it matters to me”.[9]

The same noun is Spanish interés, first recorded in 1438.[10]

Earliest recorded meaning

Houaiss and Cunha date the word to the 15th century.[2][4] The oldest dictionaries give it the sense “profit, gain”: Barbosa (1611) and Pereira (1697) render it with Latin lucrum and quaestus.[11][12]

Semantic evolution

In the 16th century the word meant gain and advantage: in a pastoral eclogue Camões has a shepherdess say that she sought knowledge, not gain (Que buscava saber, não interesse).[13] Bluteau (1712–1728) defines it as the profit or advantage one draws or hopes for from something, and notes that in a phrase such as suâ interesse the same form is a Portuguese noun and a Latin verb.[9] Morais (1789) adds the legal sense, the sum of a lost profit owed by someone who does not pay a debt in time, and the phrase servir sem interesse “to serve without payment”.[14]

Figueiredo (1899) has the modern senses beside the old: selfish greed, importance, attraction and sympathy, zeal, and interest on capital.[15] The psychological sense, the attention a thing draws, is now the main one in the dictionaries of Portugal.[16][17]

Timeline

  • 15th century – first records, spelt jnteresse, interese and ynterese.[2][4]
  • 1538 – ymterese in a private letter.[3]
  • 1611 – Barbosa renders it “profit” and lists interesseyro.[11]
  • 1712–1728 – Bluteau derives it from Latin mea interest.[9]
  • 1789 – Morais gives the legal sense “lost profit owed” and servir sem interesse.[14]
  • 1899 – Figueiredo lists “selfish greed”, “attraction” and “interest on capital”.[15]

Meanings

Noun

  1. What is important, useful or advantageous to someone; benefit, advantage: por interesse da comunidade.[2][18]
  2. The curiosity or attention one feels for what seems worth notice: ouviu tudo com grande interesse.[2][16][1]
  3. The quality of something that holds the attention: um livro sem interesse.[2][16]
  4. Importance given to something.[2]
  5. Goodwill and concern for a person.[2][19]
  6. Attachment to one's own advantage; self-interest, greed.[2][20][1]
  7. A share in the profits of a firm.[2][17]
  8. (finance) Income from the interest on a capital; juro.[2][18]

Word family

  • interessar
  • interesseiro
  • desinteresse

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 Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. interesse
  3. ^ 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. interesse
  4. ^ a b c Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. interesse
  5. ^ Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press, p. s.v. intersum
  6. ^ Nascentes, Antenor (1966), Dicionário etimológico resumido, Rio de Janeiro: Instituto Nacional do Livro, p. s.v. interesse
  7. ^ Niermeyer, J. F. (1976), Mediae Latinitatis Lexicon Minus, Leiden: Brill, p. s.v. interesse
  8. ^ du Cange, Charles du Fresne, et al. (1883–1887), Glossarium mediae et infimae latinitatis, augmented ed. by Léopold Favre, Niort: L. Favre, p. s.v. interesse
  9. ^ a b c Bluteau, Raphael (1712–1728), Vocabulario portuguez e latino, 8 vols. + 2 supplement vols., Coimbra / Lisboa (CLP transcription, Universidade de Aveiro), p. s.v. interesse
  10. ^ Corominas, Joan (1973), Breve diccionario etimológico de la lengua castellana, 3rd ed., Madrid: Gredos, p. s.v. interés
  11. ^ a b Barbosa, Agostinho (1611), Dictionarium lusitanicolatinum, Braga: Fructuoso Lourenço de Basto (CLP transcription, Universidade de Aveiro), p. s.v. interesse
  12. ^ 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. interesse
  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. 3, 1142
  14. ^ a b 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, 729
  15. ^ a b Figueiredo, Cândido de (1899), Novo diccionário da língua portuguesa, 1st ed., 2 vols., Lisboa: Tavares Cardoso & Irmão, p. s.v. interesse
  16. ^ a b c 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. interesse
  17. ^ a b Porto Editora (2013), Grande Dicionário da Língua Portuguesa, Porto: Porto Editora, p. 5338
  18. ^ a b Dicionário Priberam da Língua Portuguesa, Lisboa: Priberam Informática, https://dicionario.priberam.org, p. s.v. interesse
  19. ^ 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. interesse
  20. ^ Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. interesse

Related etymologies

Cite this entry

“Interesse.” Etymologically, 15 Nov. 2026, etymologically.com/pt/interesse. Accessed 16 Nov. 2026.

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