fif•ty-firstPronunciation: (fif'tē fûrst'), [key]
next after the fiftieth; being the ordinal number for 51.
being one of 51 equal parts.
a fifty-first part, esp. of one (1/51
the fifty-first member of a series.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.