Definition 2023




Latin cardinal numbers
I II  > 
    Cardinal : ūnus
    Ordinal : prīmus
    Adverbial : semel
    Multiplier : simplex
    Distributive : singulī
Latin Wikipedia article on ūnus

Alternative forms

  • Symbol: I


ūnus m (feminine ūna, neuter ūnum); irregular first/second declension

  1. (cardinal) one; 1
    • 8 CE, Ovid, Metamorphoses 6.644–645
      satis illi ad fata vel unum vulnus erat: iugulum ferro Philomela resolvit
      Sufficient was this one wound to kill; but Philomela also cut open the throat
    • 405 CE, Jerome, Vulgate Nehemiae.1.2
      et venit Anani unus de fratribus meis ipse et viri ex Iuda et interrogavi eos de Iudaeis qui remanserant et supererant de captivitate et de Hierusalem
      and Hanani came, one of my brethren, he and certain men of Judah; and I asked them concerning the Jews that had escaped, which were left of the captivity, and concerning Jerusalem
    • 6th c.Boethius, Commentarium in librum Aristotelis Peri hermeneias primae editionis, Book I, section 5
      In summam igitur ūnārum ōrātiōnum aliae sunt significātiōne ūnae, aliae coniūnctiōne.
      "In summary therefore, of one theme others are (by signification) one, some with connections."

Derived terms

Related terms



  1. (Medieval Latin) an; a


First/second declension, with genitive singular in -īus and dative singular in .

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
nominative ūnus ūna ūnum ūnī ūnae ūna
genitive ūnīus ūnōrum ūnārum ūnōrum
dative ūnī ūnīs
accusative ūnum ūnam ūnum ūnōs ūnās ūna
ablative ūnō ūnā ūnō ūnīs
vocative ūne ūna ūnum ūnī ūnae ūna

Usage notes

The plural forms are only used with pluralia tanta and do not exist for the indefinite article. For more information see Appendix:Latin cardinal numbers.



  • unus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • unus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • Félix Gaffiot (1934), “unus”, in Dictionnaire Illustré Latin-Français, Paris: Hachette.
  • Meissner, Carl; Auden, Henry William (1894) Latin Phrase-Book, London: Macmillan and Co.
    • a day's journey: iter unius diei or simply diei
    • to collect together at one spot: in unum locum convenire, confluere
    • one or two days: unus et alter dies
    • one, two, several days had passed, intervened: dies unus, alter, plures intercesserant
    • to take in everything at a glance: omnia uno aspectu, conspectu intueri
    • one thing still makes me hesitate: unus mihi restat scrupulus (Ter. Andr. 5. 4. 37) (cf. too religio, sect. XI. 2)
    • to collect, accumulate instances: multa exempla in unum (locum) colligere
    • to choose one from a large number of instances: ex infinita exemplorum copia unum (pauca) sumere, decerpere (eligere)
    • Solon, one of the seven sages: Solo, unus de septem (illis)
    • all agree on this point: omnes (uno ore) in hac re consentiunt
    • (ambiguous) unanimously: una voce; uno ore
    • unanimously: uno, communi, summo or omnium consensu (Tusc. 1. 15. 35)
    • to give a general idea of a thing: in uno conspectu ponere aliquid
    • to give a general idea of a thing: sub unum aspectum subicere aliquid
    • to have a general idea of a thing: uno conspectu videre aliquid
    • to say not a syllable about a person: ne verbum (without unum) quidem de aliquo facere
    • one of the crowd; a mere individual: unus de or e multis
    • an ordinary, average Roman citizen: unus e togatorum numero
    • monarchy: imperium singulare, unius dominatus, regium imperium
    • to concentrate all the troops at one point: cogere omnes copias in unum locum
    • they perished to a man: ad unum omnes perierunt
    • I will only say this much..: tantum or unum illud or hoc dico
    • (ambiguous) to travel together: una iter facere
    • (ambiguous) all are unanimous: una et consentiens vox est
    • (ambiguous) unanimously: una voce; uno ore
  • unus in Ramminger, Johann (accessed 16 July 2016) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700, pre-publication website, 2005-2016