Etymologically

Etymology and origin of the French word traître

Confidence
Established
Formation
Inherited
First attested
c. 980 Passion (object case tradetur) More words from the 10th century
Inherited from
Latin traditor via Old French
Ultimate origin
Latin trāditor
Etymology tree
inherited borrowed derived
Latin trāns
French très
Spanish tras
Italian tras-
Latin trādō
Italian tradire
Romanian trăda
Latin trāditor
French traître
Italian traditore
Spanish traidor
From the same root
English traitor ← trāns
Latin trāmes ← trāns
Latin tranquillus ← trāns
Latin trānsferō ← trāns
Latin trānstrum ← trāns
Spanish atrás ← tras
Spanish detrás ← tras
Latin trāditiō ← trādō
Romanian trădare ← trādō
Romanian trădător ← trăda

Pronunciation

Forms

traître m (plural traîtres, feminine traîtresse)[1] Old French traïtre (subject case) beside traïtor, traïtur (object case), the object case first found as tradetur about 980 in the Passion.[2][3][4] The spelling traître is recorded from 1530, when it was used in all functions;[2][4][5] trahistre was still sometimes written in the 16th century.[2][4][5] Feminine traîtresse, from the late 12th century.[2][3]

Etymology

It is inherited from Old French traïtre, inherited from Latin trāditor (“one who hands over, a betrayer”), the Old French subject case (nominative) of the word.[3][2][6][1][7] The Latin noun was adapted under the influence of trahir (Old French traïr).[3][6][8] Old French also had an object case from trāditōrem, first written tradetur and later traïtor; the subject case won out because the word was so often used to address or call someone a traitor.[2][6][3] Littré notes that the Old French form presupposes a Gallo-Roman stress on the first syllable of the Latin word, and that the contraction of traïstre to the modern form was complete by the 16th century.[5]

The Latin noun is formed from the supine of trādō (“to hand over”), itself made from dō (“to give”).[2][9] Cognate with Italian traditore, Occitan traidor, Catalan traïdor, Spanish traidor, Portuguese traidor and Romanian trădător.[9][5] The learned doublet is traditeur.[9]

Earliest recorded meaning

The object case is found first, as tradetur in the Passion of about 980.[3][2] About 1100 the Chanson de Roland uses traïtre for one who betrays: Li reis Marsile i fit mult que traïtre “King Marsile acted there very much as a traitor”.[3][5]

Semantic evolution

Besides the person who betrays, the word qualified what shows treachery from the 12th century.[2] About 1360 it was first applied to a person capable of betraying.[2] The feminine traîtresse is found as an adjective about 1175 and as a noun in the 13th century.[3][2]

In classical French traître and traîtresse weakened to mean an unfaithful lover (1652, Corneille) and became terms of abuse for anyone one was angry with (1642), uses now literary or playful.[2][3] From the 16th century the adjective was applied to things more dangerous than they look, first in Ronsard in 1552,[3][9] and Littré records it of animals that bite or kick unexpectedly.[5] The phrase en traître “treacherously” dates from Corneille's Cid (1636), and pas un traître mot “not a single word” is recorded by the Académie in 1798.[3]

traîtreusement (13th century) comes from an old adjective traîtreux, out of use since the 18th century, and traîtrise (1810) is a provincial word, from Lyon.[6][10]

Timeline

  • c. 980 – The object case tradetur appears in the Passion.[3][2]
  • c. 1100 – Traïtre is used in the Chanson de Roland.[3][5]
  • c. 1175 – The feminine traitresse is used as an adjective.[3][2]
  • 1530 – The spelling traître is recorded.[2][4]
  • 1552 – Ronsard uses the adjective of something more dangerous than it seems.[3][9]
  • 1636 – En traître appears in Corneille's Cid.[3][4]
  • 1642 – Used as a term of abuse.[2][4]
  • 1798 – The Académie records le traître mot.[3]
  • 1810 – Traîtrise is recorded.[6]

Meanings

Noun

  1. A traitor, a person who betrays someone or something.[3][9][1]
  2. By extension, a treacherous, two-faced person.[3]
  3. (dated) A scoundrel, used as an insult.[9][2]
  4. En traître: treacherously, by surprise, as in prendre quelqu'un en traître.[9][3]

Adjective

  1. Who betrays or is capable of betraying: traître à sa patrie.[9][1]
  2. More dangerous than it appears, said of things and animals: un chien traître.[3][9][5]
  3. Pas un traître mot: not a single word.[3]

Word family

  • traîtreusement
  • traîtrise

Usage notes

The feminine is traîtresse, both noun and adjective.[1][9]

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 l m n o p q Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  3. ^ a b c d e f g h i j k l m n o p q r s t u v 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
  4. ^ a b c d e f Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse
  5. ^ a b c d e f g h Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  6. ^ a b c d e 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. 13/2, 152b
  8. ^ Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  9. ^ a b c d e f g h i j k Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert
  10. ^ Picoche, Jacqueline (1991), Dictionnaire étymologique du français, Paris: Le Robert (Les Usuels du Robert)

Related etymologies

Cite this entry

“Traître.” Etymologically, 15 Nov. 2026, etymologically.com/fr/tra%C3%AEtre. Accessed 15 Nov. 2026.

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