twenty-first

twenty-first

twenty-first [ordinal number]

 21st written as a word

بیست و یکم، بیست و یکمین

مثال: 

the twenty-first century

قرن بیست و یکم

 21st written as a word

معادل فارسی: 

بیست و یکم، بیست و یکمین

مثال انگلیسی: 

the twenty-first century

قرن بیست و یکم

Longman Dictionary of Contemporary English

twenty-first

ˌtwenty-ˈfirst BrE AmE noun [countable usually singular]
your twenty-first ↑birthday or the celebration you have for it

Oxford Advanced Learner's Dictionary

twenty-first

ˌtwenty-ˈfirst [twenty-first]      noun singular (informal, especially BrE)
a person's 21st birthday and the celebrations for this occasion
She's having a party on her twenty-first.

His parents gave him a car for his twenty-first.

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

ˌ twenty- ˈ first / ˌtwen.tiˈfɜːst /   / -t̬iˈfɝːst / ordinal number

21st written as a word:

the twenty-first century

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