confirmation
/ˌkɑːnfɚˈmeɪʃən/
noun
plural -tions
[noncount] :proof which shows that something is true or correct
a response which shows that information is received and understood especially; :a response that makes a purchase, appointment, etc., definite or official [count]
[noncount] :the act of giving official approval to something or someone
a ceremony in which someone becomes a full, adult member of a religion [noncount]