Etymologically

Etymology and origin of the Latin word decorum

Confidence
Established
Formation
Derivation
First attested
81–43 BC Cicero More words from the 1st century BC
Ultimate origin
Latin decōrus
Etymology tree
inherited borrowed derived
Latin decet
Latin decor
Latin decōrus
English decorous
Latin decōrum
English decorum
From the same root
Latin addecet ← decet
Latin decēns ← decet
Latin dēdecet ← decet
Latin decore ← decōrus
Latin indecōrus ← decōrus

Pronunciation

  • Classical: [dɛˈkoː.rũː][1]
  • Ecclesiastical: [deˈkɔː.rum][1]

Forms

decōrum n (genitive decōrī); second declension[1]

Etymology

It is from Latin decōrus (“handsome, seemly”), used as a noun in the neuter.[2][3] The adjective is formed from decor (“beauty, grace”),[4] a noun which de Vaan takes to be formed productively to decet (“it is fitting”) and which gave the adjective its long ⟨ō⟩.[5] He traces the verb to Proto-Italic *dek-ē- (“fits, is right”) and Proto-Indo-European *deḱ-eh₁-.[5]

Earliest recorded meaning

As a noun it is found in Cicero, who uses it for what is fitting or becoming, the Latin name for what the Greeks called tò prépon.[2][6]

Semantic evolution

In Cicero it is a term of ethics and rhetoric, the seemliness that suits a person, a subject or an occasion;[2][6] Tacitus also has it.[6] Köbler's entry, which begins with Seneca, glosses it as becoming behaviour and grace.[7]

Polish medieval Latin used the plural for the ornaments of dress or of a building, and the word also for an honour or distinction.[8] English borrowed it in the 1560s for what is proper in a literary or artistic composition.[3] From the 1580s it also meant propriety of speech, behaviour or dress.[3] Italian decoro is a borrowing of it too.[1][9]

Timeline

  • 81–43 BC – Cicero uses it as a noun for propriety.[2][6][7]
  • 4 BC–65 AD – Seneca is Köbler's first author for it.[7]
  • 1560s – English borrows it as decorum.[3]

Meanings

Noun

  1. What is fitting or becoming; propriety, seemliness.[10][2][6]
  2. Grace, comeliness.[7][11]
  3. (Medieval Latin, plural) Ornaments of dress or of a building.[8]
  4. (Medieval Latin) An honour, distinction.[8]

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  3. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  5. ^ a b de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  6. ^ a b c d e Simpson, D. P. (1959), Cassell's New Latin Dictionary, London: Cassell
  7. ^ a b c d Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  8. ^ a b c Lexicon mediae et infimae Latinitatis Polonorum (1953–), Kraków: Instytut Języka Polskiego PAN; electronic ed. elexicon.scriptores.pl
  9. ^ Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
  10. ^ Lewis, Charlton T. (1890), An Elementary Latin Dictionary, New York: American Book Company
  11. ^ Bianchi, Rossella; Lelli, Olga (2014), VOLI: Vocabolario di latino, Florence: Le Monnier
Cite this entry

“Decorum.” Etymologically, 7 Nov. 2026, etymologically.com/la/decorum. Accessed 8 Nov. 2026.

Last edited on . ·