Pronunciation: (fif'tē-thûrd'), [key]
1. next after the fifty-second; being the ordinal number for 53.
2. being one of 53 equal parts.
1. a fifty-third part, esp. of one (1/53).
2. the fifty-third member of a series.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.