Meaning of “birthday” - Learner’s Dictionary

birthday

noun [ C ] us uk /ˈbɜːθdeɪ/

A1 the day on which someone was born, or the same date each year:

She is celebrating her seventieth birthday.
Happy Birthday!
a birthday cake/party

More examples

  • He's asked for a bike for his birthday.
  • I'm so sorry I missed your birthday.
  • Are you taking her out for her birthday?
  • David gave me these earrings for my birthday.
  • It's Johann's birthday today.

(Definition of “birthday” from the Cambridge Learner’s Dictionary © Cambridge University Press)