Etymologically

Etymology and origin of the French word tertiaire

Confidence
Established
Formation
Borrowing
First attested
1641 More words from the 17th century
Borrowed from
Latin tertiarius
Ultimate origin
Latin tertius
Etymology tree
inherited borrowed derived
Latin tertius
French tiers
Italian terzo
Romanian terțiu
Spanish tercio
Latin tertiārius
Spanish tercero
English tertiary
French tertiaire
From the same root
Latin sēstertius ← tertius

Pronunciation

  • /tɛʁ.sjɛʁ/[1]

Forms

tertiaire (plural tertiaires)[1]

Etymology

It is borrowed from Latin tertiārius (“containing a third, of a third”),[2][3][1] from tertius (“third”).[2][3][4] The geological term (1779) was formed on the model of primaire and secondaire.[3][5][6] The religious sense, “member of a third order”, is a separate borrowing from Church Latin tertiārius, a specialization of the classical word, applied to the third order (ordō (“order”));[2][3][7] it was first adapted as tierçaire (1690).[2][7] The economic sense follows the English tertiary of English-speaking economists.[3]

Earliest recorded meaning

The DHLF dates the religious word to 1641, for a member of a third order, a lay congregation affiliated with a religious order.[3] The geological adjective is first found in 1779 in Horace-Bénédict de Saussure's Voyages dans les Alpes, in montagnes tertiaires.[2][3]

Semantic evolution

In geology it was first applied to terrains and rocks formed in an era following those just named primary and secondary, and then to that era itself.[3] Brongniart made the geological sense more precise in 1807,[3][5] terrains tertiaires is found in Humboldt in 1823, période tertiaire in 1845–1846, and the noun le tertiaire in 1882.[2][3]

Medicine took it for the third phase of a disease, especially of syphilis (1910).[2][3] In economics it names, from about 1950, the sector of services, management and organization, set against the primary (agriculture) and secondary (industry) sectors: biens tertiaires is recorded in 1952 and secteur tertiaire in 1955.[2][3] As a noun it also came to mean a person working in this sector (1959 according to the DHLF, 1968 according to the TLFi).[3][2]

Timeline

  • 1641 – Borrowed as a term of religion, for a member of a third order.[3]
  • 1690 – Furetière records the religious word in the form tierçaire.[2][7]
  • 1779 – Saussure writes of montagnes tertiaires.[2][3]
  • 1807 – Brongniart makes the geological sense more precise.[3][5]
  • 1812 – The religious noun is recorded as tertiaire.[2][7]
  • 1882 – Le tertiaire is used as a noun for the geological era.[2][3]
  • 1910 – Medicine applies it to the third stage of syphilis.[2][3]
  • 1952 – Fourastié writes of biens tertiaires in economics.[2]
  • 1955 – Secteur tertiaire is recorded.[2][8]

Meanings

Adjective

  1. (geology) Of the Tertiary era, between the Secondary and the Quaternary;[2][6] le Tertiaire: that era.[2][6]
  2. (medicine) Forming the third phase of a disease: une syphilis tertiaire.[2][6]
  3. (economics) Secteur tertiaire: the service sector of the economy, beside the primary and secondary sectors; also le tertiaire.[2][6][3]
  4. Occupying the third rank.[4]

Noun

  1. (Catholicism) A member of a third order, a lay congregation affiliated with a religious order.[2][3]
  2. (economics) A person who works in the service sector.[2][3]

Word family

  • tertiarisation

Usage notes

The DHLF treats the religious word and the geological word as two separate entries, both borrowed from Latin tertiārius at different times.[3] Littré also records it in botany for a branching of the third degree.[4]

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 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
  3. ^ a b c d e f g h i j k l m n o p q r s t u v Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  4. ^ a b c Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  5. ^ a b c Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  6. ^ a b c d e Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert
  7. ^ a b c d Bloch, Oscar; Wartburg, Walther von (1989), Dictionnaire étymologique de la langue française, 8th ed., Paris: Presses universitaires de France
  8. ^ 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

“Tertiaire.” Etymologically, 15 Nov. 2026, etymologically.com/fr/tertiaire. Accessed 15 Nov. 2026.

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