undecim

• Symbol: XI

From earlier *oinodecem, from Proto-Indo-European *óynom déḱm̥t, corresponding to ūnus (“one”) + decem (“ten”).

• (Classical) IPA^(key): /ˈuːn.de.kim/, [ˈuːn̪d̪ɛkɪ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈun.de.t͡ʃim/, [ˈun̪d̪et͡ʃim]

ūndecim (indeclinable)

1. eleven; 11
   • 27 BCE – 25 BCE, Titus Livius, Ab Urbe Condita 27:

     ubi et ipse Cn. Fuluius cum undecim tribunis militum cecidit

     It was here that Cn. Fulvius fell together with eleven military tribunes.

   • 405 CE, Jerome, Vulgate Actus Apostolorum.2.22:

     stans autem Petrus cum undecim levavit vocem suam et locutus est eis viri iudaei et qui habitatis Hierusalem universi hoc vobis notum sit et auribus percipite verba mea

     But Peter, standing up with the eleven, lifted up his voice, and said unto them, Ye men of Judaea, and all ye that dwell at Jerusalem, be this known unto you, and hearken to my words:

• Appendix:Latin cardinal numbers

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