Twenty-first Definition

adjective

The ordinal form of the number twenty-one.

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Synonyms:
abbreviation

21st, 21st, XXI.

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noun
The person or thing in the twenty-first position.
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One of twenty-one equal parts of a whole, usually written .
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(informal) A party to celebrate a twenty-first birthday.

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Other Word Forms of Twenty-first

Noun

Singular:
twenty-first
Plural:
twenty-firsts

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twenty-first
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