English

Numeral

ninety-first

1. (ordinal) The ordinal form of the number ninety-one, describing a person or thing in position number 91 of a sequence.

   The answer appears on the ninety-first page of the book.

   She finished ninety-first in the race.

Usage notes

English ordinal numbers may function as either an adjective or as a noun, and almost never appear in the plural.

Abbreviations

• 91st, 91^st

Noun

ninety-first ‎(plural ninety-firsts)

1. (fractional) One of ninety-one equal parts of a whole.

   A ninety-first of 1820 is 20.