undemillesimus

• (Classical) IPA^(key): /uːn.deː.miːlˈleː.si.mus/, [uːn̪d̪eːmiːlˈlʲeːs̠ɪmʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /un.de.milˈle.si.mus/, [un̪d̪emilˈlɛːs̬imus]

ūndēmīllēsimus (feminine ūndēmīllēsima, neuter ūndēmīllēsimum); first/second-declension numeral

1. 999th
   • 1702, Johanne Styllero, Atlas Oratorius in Gloriam B. Virginis Mariæ Sacratus, & Juxta Ordinem Septem Festorum, page 31:

     Etſi autem Sanctum hoc, quod hodie veneramur, nomen nequaquam ullâ Cabalæ ſuæ menſurâ numerum attingat undemilleſimum, unde præſens pendet animadverſio; […]

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   • 1706, Philippo Rondinino Faventino, De S. Clemente Papa et Martyre Ejusque Basilica in Urbe Roma, page 254:

     Primum itaque quod præſto ſit monumentum, incidit ſub Silveſtro II. Romano Pontifice a Cardinali Baronio ad annum undemilleſimum literis conſignatum de Francone epiſcopo Wormatienſi.

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   • 1722, Thesaurus Antiquitatum et Historiarum Italiae, column 149:

     […] præterea vero etiam Bernardinus Corius in Hiſtoria Mediolanenſi ad Annum Chriſti Undemilleſimum: […]

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   • 1739, Acta Sanctorum Ordinis S. Benedicti, page 333:

     Opus ſuum nuncupat Chriſtiano ſancti Pantaleonis Abbati, qui reſtituto a Brunone Pontifice monaſterio præſuit ad annum Chriſti undemilleſimum.

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   • 1846, De Vrbe et Antiquitatibus Matisconensibus Liber, ex Codice Autographo Erutus a I. Baux, page 33:

     Sicque pax et nupti, Milonis judicio, inter Willelmum et Bertham ictæ, et comitatus utrique communis effectus, eo quo Robertus post Hugonem Francis regnare cœpit anno, qui fuit pietatis nostræ undemillesimus; […]

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First/second-declension adjective.