nine•ty-firstPronunciation: (nīn'tē-fûrst'), [key]
next after the ninetieth; being the ordinal number for 91.
being one of 91 equal parts.
a ninety-first part, esp. of one (1/91
the ninety-first member of a series.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.