Definition of birthday in English:


Line breaks: birth|day
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.
More 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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a slit made by cutting with a saw