LATIN DICTIONARYLexicon Latīnum
numeralfirst/second-declension numeral

milliōnēsimus

milliōnēsimus (feminine milliōnēsima, neuter milliōnēsimum)
Classical[mɪl.li.oːˈneː.sɪ.mʊs]Ecclesiastical[mil.li.oˈnɛː.s̬i.mus]

Meaning

  1. New Latinnumeralmillionth
    Hoc poſito habet quidem neceſſitatem non exiſtendi, niſi poſt illa nongenta nonaginta nouem, quæ ante fluxerunt: non tamen habet neceſſitatem, quod illa eadem realiter fluxerint; neque vt ſola illa realiter fluxerint; contingere potuit, vt non eſſet milleſimum, ſed primum, vel millioneſimum.1674, Triennivm Philosophicvm Quod P. Andreas Semery Remvs e Societate Iesv. In Collegio Romano Philosophiæ Iterum Professor Dictabat, page 714:
    Exemplum 1. Quod Tuum est: Proponatur series ad terminum millionesimum prolongata:[…]18th century, Correspondance Mathematique et Physique de Quelques Cèlébres Gèométres du XVIII^(ème) Siècle, published 1843, page 46:

Declension

singular
formmasculinefeminineneuter
nominativemilliōnēsimusmilliōnēsimamilliōnēsimum
genitivemilliōnēsimīmilliōnēsimaemilliōnēsimī
dativemilliōnēsimōmilliōnēsimaemilliōnēsimō
accusativemilliōnēsimummilliōnēsimammilliōnēsimum
ablativemilliōnēsimōmilliōnēsimāmilliōnēsimō
vocativemilliōnēsimemilliōnēsimamilliōnēsimum
plural
formmasculinefeminineneuter
nominativemilliōnēsimīmilliōnēsimaemilliōnēsima
genitivemilliōnēsimōrummilliōnēsimārummilliōnēsimōrum
dativemilliōnēsimīsmilliōnēsimīsmilliōnēsimīs
accusativemilliōnēsimōsmilliōnēsimāsmilliōnēsima
ablativemilliōnēsimīsmilliōnēsimīsmilliōnēsimīs
vocativemilliōnēsimīmilliōnēsimaemilliōnēsima

Origins

From milliō (“million”) + -ēsimus (“-th”).

Quick answers

What does milliōnēsimus mean in Latin?
milliōnēsimus, a numeral, means “millionth”.
How do you pronounce milliōnēsimus?
In classical Latin, [mɪl.li.oːˈneː.sɪ.mʊs]; in ecclesiastical (church) Latin, [mil.li.oˈnɛː.s̬i.mus].