twenty-first Meaning in the Cambridge English Dictionary
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Meaning of “twenty-first” in the English Dictionary

"twenty-first" in British English

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twenty-firstordinal number

uk   /ˌtwen.tiˈfɜːst/  us   /-t̬iˈfɝːst/
21st written as a word: the twenty-first ​century

twenty-firstnoun [C]

uk   /ˌtwen.tiˈfɜːst/  us   /-t̬iˈfɝːst/ (also twenty-first birthday) UK
the ​day on which a ​personreaches the ​age of 21 and is ​traditionally said, in ​Westernsocieties, to ​become an ​adult: It's Jamie's twenty-first next ​Friday. Her ​dad gave her a ​car for her twenty-first.
(Definition of twenty-first from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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