English

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English ordinal numbers
 <  80th 81st 82nd  > 
    Cardinal : eighty-one
    Ordinal : eighty-first

Adjective

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eighty-first

  1. The ordinal form of the number eighty-one, describing a person or thing in position number 81 of a sequence.
    The answer appears on the eighty-first page of the book.
    She finished eighty-first in the race.

Usage notes

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

Synonyms

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Translations

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Noun

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eighty-first (plural eighty-firsts)

  1. One of eighty-one equal parts of a whole.
    An eighty-first of 1620 is 20.

Translations

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