Latin numbers (edit)
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9  → 
    Cardinal: octō
    Ordinal: octāvus
    Adverbial: octiēs
    Multiplier: octuplus, octuplex, octoplus
    Distributive: octōnī
    Fractional: octāns


Distributive form of octō (eight)



octōnī (feminine octōnae, neuter octōna); first/second-declension adjective, plural only

  1. eight at a time, by eights, eight each
    • c. 52 BCE, Julius Caesar, Commentarii de Bello Gallico 7.73:
      Huius generis octoni ordines ducti ternos inter se pedes distabant.
      Rows by eights of this kind were dug, they stood apart three feet between them.
    • c. 15 BCE, Vitruvius, De architectura 3.1:
      Pseudodipteros autem sic collocatur, ut in fronte et postico sint columnae octonae, in lateribus cum angularibus quindenae.
      The Pseudodipteros, however, is thus assembled so that there are eight columns each in front and rear, fifteen each on the sides including the corner ones.
    • 1611, Johannes Kepler, Strena seu de nive sexangula 20:
      Etenim si cubo adimas angulos suos octonos resectos lateribus aequalibus, introrsumque componas plane constitues octaedron.
      Moreover if you remove from a cube its eight corners each cut on equal sides, and arrange them facing inwards, you will clearly produce an octahedron.


First/second-declension adjective, plural only.

Number Plural
Case / Gender Masculine Feminine Neuter
Nominative octōnī octōnae octōna
Genitive octōnōrum octōnārum octōnōrum
Dative octōnīs
Accusative octōnōs octōnās octōna
Ablative octōnīs
Vocative octōnī octōnae octōna

Derived termsEdit


  • octoni in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • octoni in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • octoni in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette