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Definition of birthday noun from the Oxford Advanced American Dictionary

  

birthday

 noun
noun
NAmE//ˈbərθdeɪ//
 
 
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  •  the day in each year that is the same date as the one on which you were born Happy Birthday! Oliver's 13th birthday a birthday card/party/present
    • Idioms
    in your birthday suit (humorous)
     
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    not wearing any clothes
    See birthday in the Oxford Advanced Learner's Dictionary
    Check pronunciation: birthday

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