Definition of birthday noun from the Oxford Advanced American Dictionary

  

birthday

 noun
noun
NAmE//ˈbərθdeɪ//
 
 
jump to other results
  •  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)
     
    jump to other results
    not wearing any clothes
    See the Oxford Advanced Learner's Dictionary entry: birthday