Meaning of “confirmation” - Learner’s Dictionary

confirmation

noun [ C, U ] uk us /ˌkɒnfəˈmeɪʃən/
ANNOUNCEMENT

B2 an announcement or proof that something is true or certain:

You'll receive written confirmation of your reservation within five days.
RELIGION

a special ceremony in which someone becomes a full member of the Christian Church

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