undecentum

• Symbol: XCIX

Literally "one from one hundred"; ūnus (“one”) + dē (“from”) + centum (“hundred”)

• (Classical Latin) IPA^(key): /uːn.deːˈken.tum/, [uːn̪d̪eːˈkɛn̪t̪ʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /un.deˈt͡ʃen.tum/, [un̪d̪eˈt͡ʃɛn̪t̪um]

ūndēcentum (indeclinable)

1. ninety-nine; 99
   • 77-78 — Pliny the Elder, Naturalis Historia, Book VII, section 214

     nec congruēbant ad hōrās eius līneae, pāruērunt tamen eī annīs ūndēcentum, ...

     Although the threads did not come together for those hours, they were evident those ninety-nine years, ...

Alternative form to nōnāgintā novem (“ninety-nine”) and novem et nōnāgintā (“nine and ninety”). The only Classical attestation is from Pliny the Elder.

• centum

• Appendix:Latin cardinal numbers

• “undecentum”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• undecentum in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.