Etymologically

Etymology and origin of the French word unisson

Confidence
Established
Formation
Borrowing
First attested
1372–1374 Nicole Oresme, Politique More words from the 14th century
Borrowed from
Latin unisonus
Ultimate origin
Latin ūnus,sonus
Etymology tree
inherited borrowed derived
Latin ūnus
Aromanian un
Catalan un
French un
Italian un
Italian uno
Romanian un
Romanian unu
Spanish uno
Latin ūnisonus
English unison
French unisson
Spanish unísono
From the same root
Latin adūnō ← ūnus
Latin noenum ← ūnus
Latin ūllus ← ūnus
Latin ūna ← ūnus
Latin ūnanimus ← ūnus
Latin ūncia ← ūnus
Latin ūndecim ← ūnus
Latin ūndēvīgintī ← ūnus
Latin ūni- ← ūnus
Latin ūnicornis ← ūnus
Latin ūnicus ← ūnus
Latin ūnilaterālis ← ūnus
Latin ūniō ← ūnus
Latin ūnitās ← ūnus
Latin ūniter ← ūnus
Latin ūniversus ← ūnus
Latin ūnusquisque ← ūnus
Romanian unic ← ūnus
Italian ognuno ← uno
Italian qualcuno ← uno
Romanian niciun ← un
Romanian unealtă ← un
Romanian uni ← un
Romanian unul ← unu

Pronunciation

  • /y.ni.sɔ̃/[1]

Forms

unisson m (uncountable)[1] First written unison (1372); the spelling unisson is a 16th-century remaking.[2]

Etymology

It is borrowed from Medieval Latin ūnisonus (“of a single sound”),[2][3][4] an adjective meaning “of uniform sound, monotonous” found in Boethius in the 6th century,[5] compounded of ūnus (“one”) and sonus (“sound”).[5][2][6] The TLFi calls the source scholastic Latin,[5] the GLLF Late Latin.[7]

Earliest recorded meaning

It is first found in Nicole Oresme's translation of Aristotle's Politics (1372–1374), for the harmony of voices or instruments sounding the same note at the same time.[5][2]

Semantic evolution

As a term of music it names a single sound produced by several voices or instruments;[2] the phrase à l'unisson “sounding the same notes together” is recorded by the Académie in 1694.[5][2] By analogy Du Bellay (1549) used it as an adjective of words that rhyme to the ear but not to the eye.[2]

Montaigne (1588) used it figuratively for a sameness of thought, writing that l'unisson est qualité du tout ennuyeuse en la conference “agreement is a wholly tedious quality in conversation”.[5][6] From there come à l'unisson de “in harmony with” (1730, Du Marsais) and the adverbial à l'unisson “in accord” (1735, Gresset),[5][2] by the same figure as au diapason.[2]

Timeline

  • 1372–1374 – Oresme uses unison of voices sounding the same note.[5][2]
  • 1549 – Du Bellay uses it as an adjective of rhymes for the ear.[2]
  • 16th century – The spelling unisson appears.[2]
  • 1588 – Montaigne uses it for agreement of minds.[5][2]
  • 1694 – The Académie records à l'unisson.[5]
  • 1730 – Du Marsais writes à l'unisson du bon sens.[5]
  • 1735 – Gresset uses à l'unisson figuratively.[5]

Meanings

Noun

  1. (music) Unison: a single sound produced at the same pitch by several voices or instruments.[4][5][1]
  2. À l'unisson: singing or playing the same notes together: Le chœur reprit le refrain à l'unisson.[4][7]
  3. (figurative, literary) Agreement of thoughts or feelings between people, harmony.[4][2]
  4. À l'unisson, à l'unisson de: in complete accord, in harmony with.[5][4][7]

References

  1. ^ a b c Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  3. ^ Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  4. ^ a b c d e Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert
  5. ^ a b c d e f g h i j k l m n 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. ^ a b Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  7. ^ a b c Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse

Related etymologies

Cite this entry

“Unisson.” Etymologically, 14 Nov. 2026, etymologically.com/fr/unisson. Accessed 15 Nov. 2026.

Last edited on . ·