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English definition of “twenty-first”

twenty-first

noun [C]     /ˌtwen.tiˈfɜːst/ US  /-t̬iˈfɝːst/ (also twenty-first birthday)
the day on which a person reaches the age of 21 and is traditionally said, in Western societies, to become an adult: It's Jamie's twenty-first next Friday. Her dad gave her a car for her twenty-first.Describing age and birthdays
(Definition of twenty-first noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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