Etymologically

un

Etymology and origin of the French word un

Confidence
Established
Formation
Inherited
First attested
c. 980, Passion de Clermont
Inherited from
Latin unus via Old French
Ultimate origin
Proto-Indo-European (*h₁óynos)
Etymology tree
inherited borrowed derived
Latin unus
French un
Latin unicornis
English unicorn
Latin unicus
French unique
English unique
Latin universus

Pronunciation

  • IPA: /œ̃/[1]
  • IPA: /ɛ̃/[1]
  • IPA: /œ̃.n‿/[1]
  • IPA: /ɛ̃.n‿/[1]

Forms

un m (feminine une, plural des, negative de)[1]

Etymology

It is inherited from Old French un, inherited from Latin ūnus (“one”).[2][3][1] The Latin numeral early took on the value of an indefinite article, already in Plautus and Cicero.[4] In the sense “alone” “ūnus” was replaced by sōlus (whence seul) or strengthened by it.[3][5] It continues Old Latin oinos, from Proto-Italic *oinos, from Proto-Indo-European *h₁óynos;[1] Rey connects it, like Ancient Greek οἴνη (oínē, “the ace on a die”), with an Indo-European root meaning “single, unique”, well represented in Germanic: German ein, English one.[3][5]

Cognate with Romanian unu, Italian uno, Occitan un, Spanish un and Portuguese um.[5][6]

Earliest recorded meaning

The numeral is found in the Passion de Clermont (about 980) for oneness: En huna fet, huna vertet “in one faith, one truth”.[7][8] Rey dates the first use as an indefinite article to the earliest texts.[3]

Semantic evolution

The indefinite article was rare in Old French: it was used only for someone or something not yet mentioned, and was left out whenever the reference was vague.[3] It became the usual indefinite article only from the 17th century.[3] Old French also had a plural uns, unes (1080), used collectively (uns cops “a volley of blows”) or for things that come in pairs (uns gans “a pair of gloves”), until the 15th century.[3][4]

As a pronoun l'un is found in the Chanson de Roland, with autre in li uns… li altre.[3][4] Un “someone” survives in familiar comme un qui… and in pas un “not one” (1559).[3][7] C'est tout un “it's all the same” is found in Rabelais (1532).[7]

Timeline

  • c. 980 – The numeral un in the Passion de Clermont.[7][8]
  • c. 1100 – Un sul mot “a single word” in the Chanson de Roland.[7]
  • 1080 – The plural uns, unes and pronominal l'un.[3]
  • 1532 – Ce m'est tout ung in Rabelais.[7]
  • 1559 – Pas un “none” in Amyot.[7]
  • 17th century – Un becomes the regular indefinite article.[3]

Meanings

Article

  1. a, an: the indefinite article; feminine une, plural des.[1][8]

Numeral

  1. one: the first number, the unit: un franc, vingt et un.[8][1]
  2. One only, single: en un jour.[8]

Pronoun

  1. One (of several): l'un d'eux, l'un… l'autre “the one … the other”.[1][3]
  2. Pas un: not one, none.[7][3]

Noun

  1. The number one, the figure 1.[7]

Word family

  • unième

References

  1. ^ a b c d e f g h i j Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  3. ^ a b c d e f g h i j k l m Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  4. ^ a b c Bloch, Oscar; Wartburg, Walther von (1989), Dictionnaire étymologique de la langue française, 8th ed., Paris: Presses universitaires de France
  5. ^ a b c Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert
  6. ^ Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  7. ^ a b c d e f g h i 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
  8. ^ a b c d e Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse

Related etymologies

Cite this entry

“Un.” Etymologically, 18 Oct. 2026, etymologically.com/fr/un. Accessed 18 Oct. 2026.

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