Etymologically

tricesimus

Etymology and origin of the Latin word tricesimus

Confidence
Established
Formation
Derivation
First attested
81–43 BC, Cicero
Ultimate origin
Latin (trīgintā)
Etymology tree
inherited borrowed derived
Latin triginta
Latin tricesimus
Latin tricies

Pronunciation

  • Classical: [triːˈkeː.sɪ.mʊs][1]
  • Ecclesiastical: [triˈt͡ʃɛː.s̬i.mus][1]

Forms

trīcēsimus (feminine trīcēsima, neuter trīcēsimum); first/second-declension numeral[1] Also trīcēnsimus.[2][3] The less frequent trīgēsimus is post-Augustan, found in Martial and Justin;[4][3] the OLD notes trig- in Gaius.[2]

Etymology

It is from Latin trīgintā (“thirty”) + -ēsimus (“-th”),[1] formed, as the OLD notes, in the same way as trīcēnī (“thirty each”).[2] For the parallel vīcēsimus (“twentieth”), spelled ⟨vīkēnsumo-⟩ in an inscription, de Vaan reconstructs Proto-Italic *wīkenssamo-, with the suffix Proto-Indo-European *-tmHo- that Indo-Iranian also has.[5] He lists trīgintā among the derivatives of trēs (“three”) and reconstructs Proto-Indo-European *trih2dḱomth2 (“thirty”).[5]

Earliest recorded meaning

Köbler's first source is Cicero,[6] who writes in a letter idem tricesimo post die feci, “I did the same thirty days later”.[4]

Semantic evolution

It is the ordinal “thirtieth”, used of days and years: Cicero has tertius et tricesimus annus, “the thirty-third year”, Livy tricesimum annum agens, “in his thirtieth year”, and Galba, writing to Cicero, legio quinta tricesima, the thirty-fifth legion.[4][3] Horace has tricesima sabbata.[4][3] Ecclesiastical Latin uses both tricesimus and trigesimus.[7]

In British medieval Latin it is also used of the thirtieth day after a death or the day of the last mass of a trental, and then as a noun.[8] Italian trentesimo continues it.[9]

Timeline

  • 81–43 BC – Cicero uses it of days and years.[4][6]
  • 65–8 BC – Horace has tricesima sabbata.[4][3][6]
  • 59 BC–17 AD – Livy has tricesimum annum agens.[4][3][6]
  • 40–102/103 AD – Martial uses the form trigesimus.[4][6]
  • 140–180 AD – Gaius writes it with trig-.[2][6]

Meanings

Numeral

  1. Thirtieth.[2][4][7]
  2. (Medieval Latin) Of the thirtieth day after a death, or the final mass of a trental; also as a noun.[8]

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d e f Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  4. ^ a b c d e f g h i Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon 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 f Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  7. ^ a b Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
  8. ^ 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
  9. ^ Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
Cite this entry

“Tricesimus.” Etymologically, 20 Oct. 2026, etymologically.com/la/tricesimus. Accessed 20 Oct. 2026.

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