Etymologically

mois

Etymology and origin of the French word mois

Confidence
Established
Formation
Inherited
First attested
c. 1100, Chanson de Roland
Inherited from
Latin mensis via Old French
Ultimate origin
Proto-Indo-European (*mēn-)
Etymology tree
inherited borrowed derived
Latin mensis
French mois

Pronunciation

Forms

mois m (invariable)[1] Old French meis (1080), mois (about 1175, Chrétien de Troyes); Middle French moys.[2][3][1]

Etymology

It is inherited from Old French meis, inherited from Latin mēnsis (“month, (plural) menses”).[4][5][6][7][1] The Latin word first meant the lunar month: in the Indo-European languages the name of the month was at first that of the Moon, which later received other names, as Ancient Greek σελήνη (selḗnē) and Latin lūna.[5] “Mēnsis”, like Ancient Greek μήν (mḗn, “month”), belongs to an Indo-European word Proto-Indo-European *mēn- (“month, moon”), probably from the root of Latin mētior (“to measure”), the Moon being the star that measures time.[8][5][8][9] The same root gave English moon, English month, German Mond and German Monat.[8]

Cognate with Italian mese, Occitan mes, Catalan mes, Spanish mes and Portuguese mês.[1][8]

Earliest recorded meaning

It is first found as meis in the Chanson de Roland (about 1100), meaning one of the twelve divisions of the year; about 1130–1140 Wace uses it for the months of pregnancy.[4][2]

Semantic evolution

From 1535 the plural also had the Latin sense “menses”, now archaic (avoir ses mois).[4][5][1] The sense “a month's pay” appears before 1614 (Brantôme), and is still current in être payé au mois and toucher son mois, le treizième mois, a year-end bonus, is recorded in 1959.[4][5][3] Le mois de Marie is the month of May devoted to the Virgin (late 19th century).[3]

Timeline

  • c. 1100 – Meis in the Chanson de Roland.[4]
  • 1130–1140 – Months of pregnancy, in Wace.[4]
  • c. 1175 – The spelling mois, in Chrétien de Troyes.[2][3]
  • 1535 – Plural mois “menses”, in Olivétan's Bible.[4]
  • Before 1614 – A month's wages, in Brantôme.[4]
  • 1959 – Le treizième mois.[3]

Meanings

Noun

  1. A month, one of the twelve divisions of the year: le mois de mai.[8][1]
  2. A period of about thirty days: dans trois mois.[8]
  3. A month's pay or rent: toucher son mois, le treizième mois.[5][3]
  4. (archaic, plural) menstruation.[1][5]
  • bimensuel
  • mensualiser
  • mensualité
  • mensuel
  • mensuellement
  • semestre
  • semestriel
  • trimestre
  • trimestriel
  • menstrues
  • Latin mēnsis

Usage notes

Mois is invariable: un mois, des mois.[1]

References

  1. ^ a b c d e f g h i j Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  3. ^ a b c d e f Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse
  4. ^ a b c d e f g h Trésor de la langue française informatisé (2004), ATILF – CNRS & Université de Lorraine, atilf.fr/tlfi; electronic version of Imbs, Paul; Quemada, Bernard, eds. (1971–1994), Trésor de la langue française, Paris: CNRS / Gallimard
  5. ^ a b c d e f g Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  6. ^ Bloch, Oscar; Wartburg, Walther von (1989), Dictionnaire étymologique de la langue française, 8th ed., Paris: Presses universitaires de France
  7. ^ Wartburg, Walther von, et al. (1922–2002), Französisches Etymologisches Wörterbuch, 25 vols., Bonn / Leipzig / Basel: Klopp / Teubner / Zbinden, p. 6/1, 713a
  8. ^ a b c d e f Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert
  9. ^ Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette

Related etymologies

Cite this entry

“Mois.” Etymologically, 18 Oct. 2026, etymologically.com/fr/mois. Accessed 18 Oct. 2026.

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