Meaning of “celebration” - Learner’s Dictionary

celebration

noun [ C, U ] uk us /ˌseləˈbreɪʃən/

B1 an occasion when you celebrate a special day or event, or the act of celebrating:

Let's buy some champagne in celebration of her safe arrival.
You've passed? This calls for a celebration.

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