Etymology and origin of the Portuguese word lei
- Confidence
- Established
- Formation
- Inherited
- First attested
- 1200s Cantigas de Santa Maria More words from the 13th century
- Inherited from
- Latin lex
- Ultimate origin
- Proto-Italic *lēg-
Etymology tree
From the same root
Pronunciation
Forms
lei f (plural leis)[1] Old Galician-Portuguese wrote lee, lei and ley, and in the 14th and 15th centuries also lley; the plural was leis, lex or leix.[2][3] Feijó (1734) and Bluteau's book of synonyms still give the spellings lei and ley side by side.[4][5]
Etymology
It is inherited from Latin lēx (“law”), written Old Galician-Portuguese lee and Old Galician-Portuguese lei in the oldest texts.[2][1][6][7] The two-syllable form, with the Latin /g/ lost between vowels, stood between the Latin word and the later monosyllable, as in Spanish.[1][8] Houaiss notes that the Latin word, a written and promulgated obligation, was opposed to mōs and cōnsuētūdō, custom or unwritten law.[2]
The same Latin word is Galician lei, Spanish ley, Catalan llei, Occitan lei, French loi, Italian legge and Romanian lege.[9][1]
The Latin word continues Proto-Italic *lēg-.[10] It is usually derived from Proto-Indo-European *leǵ- (“to gather”), the root of legō, but de Vaan marks this with a query.[10][1] Palmer proposed instead *legʰ- (“to lie”), which would make the word parallel to the English law;[11] Fortson accepts that view.[11]
Earliest recorded meaning
Houaiss's first date, 1034 (leys), is a Latin charter, and a Latin text of 1105 has lee et foro de rex de legione “the law and fuero of the king of León”.[2][3] In Galician-Portuguese the word appears in the 13th century, and its first sense there is “religion”: the Cantigas de Santa Maria speak of a servant of God e de sa ley amador “and a lover of his law”, of a lee dos crischãos “the religion of the Christians”, and of the Virgin through whom God nos deu nova lee “gave us a new law”.[12] Pero da Ponte names todas tres las leis, the Jewish, Christian and Muslim faiths.[12]
Semantic evolution
The medieval texts also use the word for the Old Testament (a Vella Lei), for a monastic rule, and for religious belief in general.[12][3] The Portuguese translation of the Fuero Real of Alfonso X already has it in the legal sense.[7] Bluteau's synonyms (decree, statute, ordinance, rule) show the legal sense dominant in the 18th century.[5]
From the legal sense came the scientific one, a constant relation between phenomena (as leis da física), and the rules of an art.[2][13] In coinage lei is the legal proportion of precious metal in an alloy, hence ouro de lei and, by extension, madeira de lei “hardwood of the best quality”.[2][14][13] In Portugal and Galicia the word also meant “affection, esteem”.[2][15][16]
Timeline
- 1034 – leys in a Latin charter.[2]
- 1105 – a Latin text has lee et foro.[3]
- 13th century – ley and lee “religion” in the Cantigas de Santa Maria.[12]
- 14th century – the spellings lex and lley.[2]
- 15th century – the plural leix.[2][3]
- c. 1510 – lei in the Vida de Santo Agostinho (witness 1480–1510).[17]
- 1697 – Pereira translates Lei as lex, praescriptum, statutum and edictum.[18]
- 1734 – Feijó gives the spellings Lei, ou Ley.[4]
Meanings
Noun
- A law: a rule laid down by the sovereign authority of a state, which all must obey: A nova lei entra em vigor amanhã.[2][19][20]
- The body of such rules; the law: Ninguém está acima da lei.[2][20]
- A rule imposed by custom, conscience or circumstances.[2][19]
- Power, dominion: a lei do mais forte “the law of the strongest”.[2][19]
- A norm or principle of an art or a discipline: as leis da harmonia.[2][19]
- (science) A constant relation between phenomena: a lei da gravidade.[2][14][13]
- (religion) A religious law; a religion: a lei de Moisés.[2][14][13]
- The legal proportion of precious metal in an alloy for coinage: ouro de lei.[2][14]
- Good quality, genuineness: madeira de lei.[2][13]
- (Portugal, regional) Affection, esteem.[2][15]
Word family
- decreto-lei
Related words
Usage notes
Fixed phrases include lei seca “prohibition”, lei da rolha “gag law” and de boa lei “genuine”.[14] In Rio Grande do Sul, lei do embudo (“funnel law”) is a law applied to favour the powerful, a phrase shared with the Spanish of the Plate.[21]
References
- ^ a b c d e f g h i Wiktionary, the free dictionary, https://en.wiktionary.org
- ^ 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. lei
- ^ a b c d e 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. lee
- ^ a b Feijó, João de Morais Madureira (1734), Orthographia, ou Arte de escrever, e pronunciar com acerto a lingua portugueza, Lisboa (CLP transcription, Universidade de Aveiro)
- ^ 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. lei
- ^ Nascentes, Antenor (1966), Dicionário etimológico resumido, Rio de Janeiro: Instituto Nacional do Livro, p. s.v. lei
- ^ a b Nascentes, Antenor (1955), Dicionário etimológico da língua portuguesa, vol. 1: Nomes comuns, Rio de Janeiro (1st ed. 1932, preface by W. Meyer-Lübke), p. s.v. lei
- ^ Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 3, 639
- ^ Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter
- ^ 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
- ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org, p. s.v. lex
- ^ a b c d 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. lei
- ^ a b c d e 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. lei
- ^ a b c d e Dicionário Priberam da Língua Portuguesa, Lisboa: Priberam Informática, https://dicionario.priberam.org, p. s.v. lei
- ^ 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. lei
- ^ Estraviz, Isaac Alonso, Dicionário Estraviz, https://estraviz.org, p. s.v. lei
- ^ Centro de Linguística da Universidade de Lisboa, CTA – Corpus de Textos Antigos, https://teitok.clul.ul.pt/cta, p. s.v. lei
- ^ Pereira, Bento (1697), Thesouro da lingoa portuguesa, in the 1697 edition of his Prosodia (1st ed. 1647; CLP transcription, Universidade de Aveiro)
- ^ a b c d Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. lei
- ^ 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. lei
- ^ Schlee, Aldyr Garcia (2019), Dicionário da Cultura Pampeana Sul-Rio-Grandense, 2 vols., Pelotas: Fructos do Paiz, p. s.v. lei
Related etymologies
Cite this entry
“Lei.” Etymologically, 15 Nov. 2026, etymologically.com/pt/lei. Accessed 16 Nov. 2026.
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