noun

1. An official indicator that things will happen as planned.

   “We will send you a written confirmation of your hotel booking.”

2. A verification that something is true or has happened.

   “The announcement in the newspaper was a confirmation of my suspicions.”

3. 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.