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Definition of Twenty-first
1. Adjective. Coming next after the twentieth in position.
Definition of Twenty-first
1. Adjective. The ordinal form of the number twenty-one. ¹
2. Noun. The person or thing in the twenty-first position. ¹
3. Noun. One of twenty-one equal parts of a whole, usually written . ¹
4. Noun. (informal) The twenty-first birthday. ¹
¹ Source: wiktionary.com