birthday - definition and synonyms

 
 
noun [countable] 

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/ˈbɜː(r)θdeɪ/
singularbirthday
pluralbirthdays
  1. the day each year that has the same date as the one on which you were born

    It’s her seventeenth birthday tomorrow.

    Her birthday is on 7th June.

    1. a.
      [only before noun] intended to celebrate someone’s birthday

      a birthday party/card/present