twenty-firstordinal number
uk/ˌtwen.tiˈfɜːst/us/ˌtwen.t̬iˈfɝːst/21st written as a word:
the twenty-first century
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Numbers: ordinal
- billionth
- eighteenth
- eighth
- eleventh
- fiftieth
- fourth
- hundredth
- millionth
- nano-
- nineteenth
- ninetieth
- quinti
- seventh
- sixteenth
- sixth
- tertius
- thirtieth
- thousandth
- twelfth
- umpteen
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twenty-firstnoun [ C ]
uk/ˌtwen.tiˈfɜːst/us/ˌtwen.t̬iˈfɝːst/also twenty-first birthday UKthe 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.
Thesaurus: synonyms and related words
Describing age & birthdays
- a ripe old age idiom
- age group
- age limit
- aged
- be knocking (on) 60, 70, etc. idiom
- gone
- junior
- nonagenarian
- octogenarian
- old
- on the right/wrong side of 40, 50, etc. idiom
- put years on sb idiom
- senior
- spring chicken
- take years off sb idiom
- teens
- this side of sth idiom
- turn
- when sb was a (mere) twinkle in their father's eye idiom
- year
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