Definition of “birthday” - English Dictionary

british dictionary

“birthday” in British English

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birthdaynoun [ C ]

uk /ˈbɜːθ.deɪ/ us /ˈbɝːθ.deɪ/

A1 the day that is exactly a year or number of years after a person was born:

Happy birthday, Flavio!
Are you going to Ellen's birthday party next week?
It's her 21st birthday.

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(Definition of “birthday” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“birthday” in American English

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birthdaynoun [ C ]

us /ˈbɜrθˌdeɪ/

the day that is an exact year or number of years after a person was born:

Today is my mother’s 49th birthday.

(Definition of “birthday” from the Cambridge Academic Content Dictionary © Cambridge University Press)