confirmation
n. C / Un. a statement or piece of evidence that shows something is definitely true. You often get this in an email or a letter after you book a flight or finish a deal.
n. the act of verifying or corroborating a statement, belief, or arrangement; evidence that provides proof of validity.
I am still waiting for a confirmation of my hotel booking.
The lawyer requested written confirmation of the agreement before proceeding with the final contract.
The discovery of the fossil provided the first physical confirmation of the theory that these two species shared a common ancestor millions of years ago.
From Middle English confirmacioun, from Old French confirmacion, from Latin cōnfirmātiō, noun of process from cōnfirmātus (“confirmed”), perfect passive participle of cōnfirmāre, from con- (“with”) + firmāre (“to firm or strengthen”). Morphologically confirm + -ation.
Uncountable when referring to the general act of verifying; countable when referring to a specific document or message.