Meaning of “congratulations” - Learner’s Dictionary

congratulations

exclamation uk us /kənˌɡrætʃʊˈleɪʃənz/

A2 something that you say when you want to congratulate someone:

Congratulations on doing an outstanding job.
I hear you're getting married. Congratulations!

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