Etymologically

Etymology and origin of the French word mercredi

Confidence
Established
Formation
Inherited
First attested
1119 Philippe de Thaon, Comput More words from the 12th century
Inherited from
Latin *Mercuris dies via Old French
Ultimate origin
Latin Mercuriī diēs

Pronunciation

  • /mɛʁ.kʁə.di/[1]
  • /mɛ.kʁə.di/[1]
  • /me.kʁə.di/[1]

Forms

mercredi m (plural mercredis)[1] Old French mercresdi (1119) and merquedi (13th century).[2][3] merkredi is recorded in 1339.[2][4]

Etymology

It is inherited from Old French mercresdi, inherited from Vulgar Latin *Mercuris diēs (“day of Mercury”), an alteration of classical Mercuriī diēs after the names of the other days of the week.[4][5][2][6] The Grand Robert and the Petit Robert give the altered form as Medieval Latin Mercoris diēs.[7][8] The classical phrase is formed from the genitive of Mercurius (“Mercury”) and diēs (“day”).[9][4]

The order with the name of the god first gave the French word and Italian mercoledì;[2][4][10] the order with the word for day first survives in Catalan dimecres, Occitan and Franco-Provençal dimecre and the Old French of Wallonia and Flanders, demerkes (13th century);[2][4][10] the name of the god alone gave Spanish miércoles and Romanian miercuri.[2][4][10]

Earliest recorded meaning

The word first appears as mercresdi in Philippe de Thaon's Comput (1119), naming the day of the week.[2][4]

Semantic evolution

The word has kept its meaning, the day between Tuesday and Thursday.[2][4] Mercredi des Cendres “Ash Wednesday”, the first day of Lent, is recorded by Robert Estienne in 1549.[9] By metonymy it has also meant a weekly gathering held on Wednesdays, a use the TLFi illustrates from Proust in 1922.[11] In France Wednesday later became the school holiday, replacing Thursday.[8]

In modern colloquial French mercredi! serves as a polite euphemism for the oath merde.[4][8][1]

Timeline

  • 1119 – Mercresdi appears in Philippe de Thaon's Comput.[2]
  • 13th century – The form merquedi is found in Villehardouin and Beaumanoir.[3]
  • 1339 – The spelling merkredi is recorded.[2]
  • 1549 – Robert Estienne records mercredi des Cendres.[9]
  • 17th century – The popular pronunciation mécredi is condemned by Vaugelas.[4][3]
  • 1922 – Proust uses mercredi for a Wednesday gathering.[11]

Meanings

Noun

  1. Wednesday, the day after Tuesday: Nous partons mercredi matin.[8][2]
  2. Mercredi des Cendres: Ash Wednesday, the first day of Lent.[8][9]

Interjection

  1. (colloquial, euphemistic) Used in place of merde: Mercredi, j'ai oublié mes clés ![8][1][4]
  • mercure
  • mercuriale
  • Latin Mercurius
  • Latin diēs

Usage notes

The pronunciation mécredi, which Vaugelas condemned, was according to Thomas Corneille the most frequent in the 17th century.[4][3] Dialect forms include Picard mécredi and Walloon dimiek.[3]

References

  1. ^ a b c d e f Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k 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
  3. ^ a b c d e Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  4. ^ a b c d e f g h i j k l Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  5. ^ Bloch, Oscar; Wartburg, Walther von (1989), Dictionnaire étymologique de la langue française, 8th ed., Paris: Presses universitaires de France
  6. ^ Wartburg, Walther von, et al. (1922–2002), Französisches Etymologisches Wörterbuch, 25 vols., Bonn / Leipzig / Basel: Klopp / Teubner / Zbinden, p. 6/2, 18b
  7. ^ Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  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. ^ a b c d Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse
  10. ^ a b c Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter
  11. ^ a b Quemada, Bernard, ed. (1959–2006), Datations et documents lexicographiques (Base historique du vocabulaire français, BHVF), Paris: Klincksieck / CNRS / Champion; ATILF

Related etymologies

Cite this entry

“Mercredi.” Etymologically, 11 Nov. 2026, etymologically.com/fr/mercredi. Accessed 12 Nov. 2026.

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