birthday

/ˈbɜrθˌdeɪ/
noun
  1. The anniversary of the day on which a person was born, often celebrated with gifts, parties, or special activities.
    • My birthday is in July, so I usually have a pool party.
    • We sang 'Happy Birthday' and then he blew out the candles.
    • She received a beautiful necklace for her 30th birthday.
  2. The date on which something (such as an organization, country, or idea) was founded or began.
    • The club's birthday party will be held at the community center.
    • This year marks the 100th birthday of the national park system.
    • The company celebrated its 50th birthday with a big event.
Synonyms
What does "birthday" mean? | whatsthatwordmean | whatsthatwordmean