English

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English ordinal numbers
 <  50th 51st 52nd  > 
    Cardinal : fifty-one
    Ordinal : fifty-first

Adjective

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fifty-first (not comparable)

  1. The ordinal form of the number fifty-one, describing a person or thing in position number 51 of a sequence.
    The answer appears on the fifty-first page of the book.
    She finished fifty-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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fifty-first (plural fifty-firsts)

  1. One of fifty-one equal parts of a whole.
    A fifty-first of 1020 is 20.

Translations

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