next after the ninetieth; being the ordinal number for 91.
being one of 91 equal parts.
a ninety-first part, especially of one (1/91).
the ninety-first member of a series.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use ninety-first in a sentence
This book, in 1895, is in its ninety-first edition of one thousand copies.
Since then she has revised it many times, and the ninety-first edition is announced.
It opens with the ninety-first year of the reign of the Judges—a time which corresponds to our year one of the Christian era.Defense of the Faith and the Saints (Volume 1 of 2) | B. H. Roberts
During these succeeding twenty years it has been greatly revised and enlarged, and it is now in its ninety-first edition.
The first meeting, according to the Abb Costaing, was not in a church, but in a meadow—as appears by the ninety-first sonnet.Curiosities of Literature, Vol. 3 (of 3) | Isaac Disraeli