Etymologically

Etymology and origin of the Latin word December

Confidence
Probable
Formation
Derivation
First attested
1st century BC, inscriptions
Ultimate origin
Latin decem
Etymology tree
inherited borrowed derived
Latin decem
French dix
Italian dieci
Latin December
German Dezember
From the same root
English decimate ← decem
Latin decanus ← decem
Latin decempeda ← decem
Latin deciens ← decem
Latin quattuordecim ← decem
Latin quindecim ← decem
Latin sedecim ← decem
Latin septendecim ← decem
Latin undecim ← decem

Pronunciation

  • Classical: [dɛˈkɛm.bɛr][1]
  • Ecclesiastical: [deˈt͡ʃɛm.ber][1]

Forms

December (feminine Decembris); third-declension three-termination adjective[1] As a noun the month is December, genitive Decembris, masculine.[2][3] Inscriptions have the spellings dekem and dicimbr, and the word is commonly abbreviated dec.[2]

Etymology

It is from Latin decem (“ten”),[4][5] because it was the tenth month of the old Roman year, which began with March.[5][1][3] How the ending was formed is uncertain.[1] The OLD reconstructs *decemo-membris, from decimus “tenth” and a form of mēnsis “month” with the suffix seen in sēmestris.[2] Wiktionary likewise suggests, with a “perhaps”, a haplology of an earlier *deke(m)-mēmbris (“of the tenth month”), from *deke(m)-mēnzris, made of ⟨decem⟩ and a derivative of *mēns (“month”).[1] Lewis & Short instead took ⟨-ber⟩ as a suffix akin to -fer (“bearing”).[3] Ancient grammarians knew that the months from Quintilis to December were named from their numbers: Varro says so.[3]

Earliest recorded meaning

It appears in inscriptions of the 1st century BC,[6] and de Vaan records it from Cicero on;[4] Cicero dates a letter by nonis illis Decembribus, “those Nones of December”.[2]

Semantic evolution

It was first an adjective, “of December”, agreeing with mensis “month” or with the names of days such as the Kalends and Nones.[2][7] Used alone as a masculine noun, it named the month itself.[2][8] December was the tenth month of the Roman year until Julius Caesar's revision of the calendar, and the twelfth and last after it.[2] Because the Saturnalia fell in it, Horace speaks of libertate Decembri, “with December freedom”, the licence of the festival,[2][7] and poets give the month epithets of cold and wine.[2][8] In the plural it could count years: Horace says he has completed “four times eleven Decembers”.[2][8] English took the name through Old French in late Old English.[5]

Timeline

  • 1st century BC – Inscriptions record the month name.[6]
  • 81–43 BC – Cicero uses it as an adjective with the Nones.[2][4][6]
  • 116–27 BC – Varro uses it alone as the name of the month.[2][6]
  • 65–8 BC – Horace speaks of the “December freedom” of the Saturnalia and counts his years in Decembers.[2][6]
  • before 66 AD – Petronius has a character ask whether it is December.[2][6]
  • late Old English – English takes the name, through Old French, as December.[5]

Meanings

Adjective

  1. Of December, the tenth month of the original Roman year and, after Caesar's reform, the twelfth.[2][3][8]

Noun

  1. The month of December.[2][3][9]
  2. (poetic, plural) Years, counted by their Decembers.[2][8]

Usage notes

December was also used as a personal name, as in the Digest.[2][10] Gaffiot heads it as a noun and treats the adjective under it.[7]

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 r Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d e f Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  4. ^ a b c de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  5. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  6. ^ a b c d e f Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  7. ^ a b c Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  8. ^ a b c d e Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  9. ^ Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
  10. ^ Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften

Borrowed into

Cite this entry

“December.” Etymologically, 24 Oct. 2026, etymologically.com/la/December. Accessed 24 Oct. 2026.

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