Definition of birthday in English:

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Pronunciation: /ˈbəːθdeɪ/


1The anniversary of the day on which a person was born, typically treated as an occasion for celebration and the giving of gifts: his twenty-ninth birthday [as modifier]: a birthday cake
More example sentences
  • Family and friends gathered around a huge birthday cake singing Happy Birthday.
  • Steve has made this cake on his birthday for his colleagues with an overwhelming positive response.
  • On our birthdays we have a cake and smiley-face stickers.
1.1The day of a person’s birth: he shares a birthday with Rod Stewart
More example sentences
  • Here are a few prominent people that share their birthdays this month.
  • I was born on his birthday and the twelfth anniversary of his return to the throne.
  • My grandfather noted that the day I was born was also the birthday of Franklin Delano Roosevelt.
1.2The anniversary of something’s origin or foundation: the seventy-fifth birthday of the Institute
More example sentences
  • Meanwhile, this Saturday is open day at the Hunt as the museum celebrates its seventh birthday.
  • The Big Issue in Scotland will also celebrate its seventh birthday on 29 June.
  • Google, celebrating its seventh birthday today, has revamped its video search service.


in one's birthday suit

humorous Naked.
Example sentences
  • I wanna walk around in my birthday suit.
  • I told her that despite it being cooler than usual… I'm still sleeping in my birthday suit.
  • Women looked away and parents shielded their children's eyes as a foreigner with a receding hairline pranced on the New Delhi railway platform in his birthday suit.
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