Etymologically

Etymology and origin of the French word trahison

Confidence
Probable
Formation
Derivation
First attested
c. 1100 Chanson de Roland More words from the 11th century
Ultimate origin
Latin trādō

Pronunciation

  • /tʁa.i.zɔ̃/[1]

Forms

trahison f (plural trahisons)[1] Old French traïsun and traïson;[2][3] trahison is found in the 13th century and became the usual spelling in the 16th.[2][3] Anglo-Norman forms include treson and treïsoun.[4]

Etymology

It is inherited from Old French traïsun, from Old French traïr (“to betray”) + -ison, the first being the old form of trahir.[5][6][3][1] The TLFi analyses the ending as the suffix -on.[5] Littré and Meyer-Lübke instead derive it from Latin trāditiō (“handing over, betrayal”), the source of the learned tradition, and Wiktionary allows both.[7][8][1] The old verb itself is a remodelling of Latin trādō (“to hand over, betray”) on the verbs in ⟨-ir⟩.[9] The ⟨h⟩ was written to keep the two vowels apart.[9]

Cognate with Old Occitan traizon, Catalan traïció, Spanish traición and Portuguese traição.[8][7]

Earliest recorded meaning

It first appears as traïsun in the Chanson de Roland (about 1100), meaning betrayal: Guenes i vint, ki la traïson fist “Guenes came there, he who committed the treason”.[5][7]

Semantic evolution

In Old French par traïson meant “treacherously” (about 1160).[5] The Anglo-French form gave English treason about 1200,[10] and English law French had graunt treysoun “high treason” in 1292.[5]

Haute trahison is a calque of the English high treason, itself made with the borrowed French word.[9][3][2] Bloch and Wartburg date it to 1677 and the TLFi to 1649; it was first said only of English events and replaced lèse-majesté for French ones towards the end of the 18th century.[9][5] Its modern sense, dealings with the enemy, dates from the Code pénal of 1810, and its use for a grave failure of the President of the Republic from 1876.[2][3]

Since 1673 (Racine) the word has also meant unfaithfulness in love,[2][3] and since 1642 (Corneille) it has meant the distortion of someone's thought in presenting it.[3][2] Littré records la trahison des sens, the surprise victory of the senses over reason.[7]

Timeline

  • c. 1100 – Traïsun appears in the Chanson de Roland.[5]
  • c. 1160 – Par traïson “treacherously” in the Roman d'Eneas.[5]
  • c. 1200 – English treisoun is borrowed from Anglo-French.[10]
  • 13th century – The spelling trahison in the Chronique de Rains.[2][7]
  • 1292 – Graunt treysoun “high treason” in Britton.[5]
  • 1538 – The refashioned form trahison.[3]
  • 1642 – Corneille uses it of distorting someone's thought.[2][3]
  • 1649 – First record of haute trahison in the TLFi.[5]
  • 1673 – Racine uses it for unfaithfulness in love.[2][3]
  • 1677 – Haute trahison, calqued on English, in Bloch and Wartburg's dating.[9][3]
  • 1810 – The Code pénal gives haute trahison its modern sense.[2][3]

Meanings

Noun

  1. treason, the crime of betraying one's country or going over to the enemy;[11][7] haute trahison, high treason, also a grave breach of duty by the President of the Republic.[11][7]
  2. Betrayal, a breach of loyalty or trust; treachery.[11][5]
  3. Serious unfaithfulness in love.[11][7]
  4. (figurative) Something that catches one out unexpectedly, a pitfall: la trahison des sens.[7][1]

Word family

  • haute trahison

References

  1. ^ a b c d e Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse
  3. ^ 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
  4. ^ Anglo-Norman Dictionary (AND2), Aberystwyth University, anglo-norman.net (2nd ed., 2005–)
  5. ^ 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
  6. ^ Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  7. ^ a b c d e f g h i Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  8. ^ a b Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter
  9. ^ a b c d e Bloch, Oscar; Wartburg, Walther von (1989), Dictionnaire étymologique de la langue française, 8th ed., Paris: Presses universitaires de France
  10. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  11. ^ a b c d Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert
Cite this entry

“Trahison.” Etymologically, 14 Nov. 2026, etymologically.com/fr/trahison. Accessed 14 Nov. 2026.

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