Etymology and origin of the Portuguese word janeiro
- Confidence
- Established
- Formation
- Inherited
- First attested
- 1265 a Portuguese document More words from the 13th century
- Inherited from
- Latin Ianuarius
- Ultimate origin
- Latin Iānus
Pronunciation
Forms
janeiro m (plural janeiros)[1] Old Galician-Portuguese wrote janeiro, janeyro and janeyrro.[2][3] Before the spelling reforms the month was written with a capital, Janeiro, which remained the rule until 1943 in Brazil and 1990 in Portugal.[1]
Etymology
It is inherited from Latin Iānuārius (“January”), written Old Galician-Portuguese janeyro in many of the oldest texts.[4][5][1][2] The Latin word was first an adjective, “of Janus”, used as a noun for the month named after Iānus, the two-faced god of doorways and beginnings.[4][6]
Houaiss derives the Portuguese word not from the classical form but from Vulgar Latin *jannarius, with the consonantal u assimilated to the n before it.[4] The DDGM likewise sees a form with a double n behind the Galician-Portuguese word rather than the *jenuarius of the Latin inscriptions,[2] and Wiktionary reconstructs an intermediate pronunciation */janˈnai̯ru/.[1]
The same Latin word is Galician xaneiro, Spanish enero, Catalan gener, French janvier and Italian gennaio.[7][1] The Spanish word comes from that inscriptional variant, and the medieval Leonese and Aragonese forms still keep its initial consonant.[8] The learned doublet of the Portuguese word is the name Januário.[1]
Earliest recorded meaning
A Latin charter of 998 already has the personal name Ianneiro.[2] The month name itself appears in Portuguese in 1265, xviijº dias andados de janeiro “eighteen days into January”, and in Galician texts from 1269, dous dias andados de janeyro.[2] The troubadour Martin Anes Marinho speaks of a colt que mh antano prometheu en janeyro “that he promised me last year in January”.[2][9]
Semantic evolution
The word has always named the first month of the year.[4][5] Bluteau's dictionary collects a long list of proverbs about it, such as da flor de Janeiro, ninguem encheo o celeiro “no one ever filled the granary with January's blossom”.[10]
In the plural the month name became a common noun for “years of age”: Nascentes explains it as the first month standing for the whole year, and Houaiss labels it a euphemistic metaphor used above all of old people.[11][4] In informal Portuguese of Portugal the word also means the mating season of cats, a sense Silva Bastos already records in 1912.[4][12]
The word passed into Kabuverdianu and Guinea-Bissau Creole as janeru and into Tetum as janeiru.[1] Since the spelling reforms it is written in lowercase, like the other month names.[1]
Timeline
- 998 – the personal name Ianneiro in a Latin charter.[2]
- 1265 – first record in a Portuguese document: xviijº dias andados de janeiro.[2]
- 1269 – dous dias andados de janeyro in a Galician document.[2]
- 1342 – the spelling janeyrro in the notarial books of Noia, beside janeyro (1345) and janeiro (1407).[3]
- 1513 – janeiro in the Livro dos Mártires.[13]
- 1712–1728 – Bluteau lists the month with its Latin names and many proverbs.[10]
- 1755 – Folqman glosses it with Latin Januarius.[14]
- 1912 – Silva Bastos records the senses “mating season of cats” and, in the plural, “years of age”.[12]
Meanings
Noun
- January, the first month of the year in the Julian and Gregorian calendars, with 31 days.[4][15][1]
- (in the plural, figurative) Years of age, said especially of old people: Já tem noventa janeiros e ainda trabalha.[4][16][17]
- (Portugal, informal) The heat of cats, their mating season.[4][18][17]
Word family
- janeiras
Related words
- Latin Iānuārius
- Galician xaneiro
- Spanish enero
References
- ^ a b c d e f g h i j k l m Wiktionary, the free dictionary, https://en.wiktionary.org
- ^ a b c d e f g h i 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. janeyro
- ^ a b 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. janeiro
- ^ a b c d e f g h i Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. janeiro
- ^ a b Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. janeiro
- ^ Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press, p. s.v. iānuārius
- ^ Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter
- ^ Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 2, 611
- ^ Universo Cantigas: Glosario da poesía medieval profana galego-portuguesa, A Coruña: Instituto da Lingua e Literatura (ILLA), Universidade da Coruña, https://www.universocantigas.gal, p. s.v. janeiro
- ^ 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. janeiro
- ^ Nascentes, Antenor (1966), Dicionário etimológico resumido, Rio de Janeiro: Instituto Nacional do Livro, p. s.v. janeiro
- ^ a b Silva Bastos, José Timóteo da (1912), Diccionario etymologico, prosodico e orthographico da lingua portugueza, Lisboa: Parceria António Maria Pereira, p. s.v. janeiro
- ^ Centro de Linguística da Universidade de Lisboa, CTA – Corpus de Textos Antigos, https://teitok.clul.ul.pt/cta, p. s.v. janeiro
- ^ Folqman, Carlos (1755), Diccionario portuguez, e latino, Lisboa: Régia Officina Silviana (CLP transcription, Universidade de Aveiro), p. s.v. janeiro
- ^ Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. janeiro
- ^ Porto Editora (2013), Grande Dicionário da Língua Portuguesa, Porto: Porto Editora, p. 5454
- ^ 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. janeiro
- ^ 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. janeiro
Related etymologies
Cite this entry
“Janeiro.” Etymologically, 15 Nov. 2026, etymologically.com/pt/janeiro. Accessed 16 Nov. 2026.
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