confirmation
con-fir-ma-tion
noun
A statement or document that verifies something.
"Check your email for the booking confirmation."
noun
A Christian ceremony where a baptised person affirms their faith.
"She received her Confirmation at the cathedral."
noun
The act of proving something is true, definite, or valid.
"We need confirmation of your attendance."
Thesaurus
Synonyms: check, verification, substantiation, ratification