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English definition of “birthday”

birthday

noun [C]     /ˈbɜːθ.deɪ/ US  /ˈbɝːθ-/
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.Describing age and birthdaysBirthdays and anniversaries
(Definition of birthday noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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