ūndēvīgintī

Meaning

1. indeclinablenineteen; 19
   Annos undeviginti natus exercitum privato consilio et privata impensa comparavi"At the age of nineteen I raised an army on my own initiative and at my own expense"c. 14 C.E., Gaius Julius Caesar Augustus, "Res gestae Divi Augusti", 1.1
   Intervalla quoque siderum a terra multi indagare temptarunt, et solem abesse a luna undeviginti partes quantam lunam ipsam a terra prodiderunt.Many persons have attempted to discover the distance of the stars from the earth, and they have published as the result, that the sun is nineteen times as far from the moon, as the moon herself is from the earth.77 CE – 79 CE, Plinius Maior, Naturalis Historia 2.83

Origins

Literally "one from twenty"; from ūnus (“one”) + dē (“from”) vīgintī (“twenty”). Compare non-subtractive forms novendecim and novemdecim.