Latin

Alternative forms

• Symbol: XVIII

Numeral

octōdecim ‎(indeclinable)

1. (cardinal, rare) eighteen; 18
   • 1543, Petrus Comestor, Historia Scholastica, III Kings, "De porticu"

     Quarum talis erat compositio: Stylus, vel stipes columnae octodecim habebat cubitos altitudinis

   • 1687, Isaac Newton, Philosophiae Naturalis Principia Mathematica, "Axiomata, sive Leges Motus"

     Si corpus Alucretur partes novem vel decem vel undecim vel duodecim, adeoque progrediatur post concursum cum partibus quindecim vel sexdecim vel septendecim vel octodecim.

Usage notes

This form is rare, and is found primarily in bookish post-Classical Latin. The usual word for eighteen in Classical Latin is duodēvīgintī.

Synonyms

• duodēvīgintī

See also

• Appendix:Latin cardinal numbers

References

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