Pronunciation: (twen'tē-fûrst', twun'-), [key]
1. next after the twentieth; being the ordinal number for 21.
2. being one of 21 equal parts.
1. a twenty-first part, esp. of one (1/21).
2. the twenty-first member of a series.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.