Etymologically

unicus

Etymology and origin of the Latin word unicus

Confidence
Established
Formation
Derivation
First attested
Plautus
Ultimate origin
Latin (ūnus)
Etymology tree
inherited borrowed derived
Latin unus
Latin unicus
English unique

Pronunciation

  • IPA (Classical): [ˈuː.nɪ.kʊs][1]
  • IPA (Ecclesiastical): [ˈuː.ni.kus][1]

Forms

ūnicus (feminine ūnica, neuter ūnicum, adverb ūnicē); first/second-declension adjective[1]

Etymology

It is from Latin unus (“one”) + -icus, as in bellicus and pūblicus.[2][1] ūnus continues Proto-Italic *oinos, from Proto-Indo-European *h₁óynos (“one”).[1]

Earliest recorded meaning

Plautus uses it of a person's only son, tuus unicus gnatus, and of having only one garment.[3][2] Köbler dates Plautus c. 250–184 BC.[4]

Semantic evolution

Its first sense is one and only, sole, as of an only son or daughter in Terence and Cicero, or the only hope in Livy.[2][5] Lucretius joins it with sōlus, “one and alone”.[5] From Afranius on it also meant having no match, singular, outstanding, as Cicero's unique example of old-time honesty.[2][6]

In medieval British Latin it was also used as a noun for an only child or son.[7] Köbler records a medieval noun for an unmarried man.[4] English unique came from French around 1600 as “single, solitary”, and as “the only one of its kind” from the 1610s.[8]

Timeline

  • c. 250–184 BC – Plautus uses it of an only son.[3][4]
  • 2nd half of the 2nd century BC – Afranius uses it of a unique talent.[2][4]
  • 81–43 BC – Cicero uses it of a unique example.[6][4]
  • c. 1600 – English unique is recorded.[8]

Meanings

Adjective

  1. One and only, sole, single.[2][3]
  2. Having no match, singular, unique; outstanding.[2][6]
  3. (Medieval Latin, as noun) An only child, only son.[7]

Word family

  • ūnicitās

References

  1. ^ a b c d e Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  4. ^ a b c d e Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  5. ^ a b Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  6. ^ a b c Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  7. ^ a b Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press
  8. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com

Descendants

Cite this entry

“Unicus.” Etymologically, 15 Oct. 2026, etymologically.com/la/unicus. Accessed 15 Oct. 2026.

Last edited on . ·