Dictionarytwen•ty-firstPronunciation: (twen'tē-fûrst', twun'-), [key] —adj. 1. next after the twentieth; being the ordinal number for 21. 2. being one of 21 equal parts. —n. 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.
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