An official indicator that things will happen as planned.
We will send you a written confirmation of your hotel booking.
A verification that something is true or has happened.
The announcement in the newspaper was a confirmation of my suspicions.
A ceremony of sealing and conscious acknowledgement of the faith in many Christian churches, typically around the ages of 14 to 18; considered a sacrament in some churches, including Catholicism, but not in most Protestant churches.