twen•ti•ethPronunciation: (twen'tē-ith, twun'-), [key]
next after the nineteenth; being the ordinal number for 20.
being one of 20 equal parts.
a twentieth part, esp. of one (1/20
the twentieth member of a series.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.