confirmation

Etymology

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.

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.
   They declare ringing confirmation for their theories even in the face of feeble data. 20 Mar 1999, Natalie Angiers, The Guardian
   The thing is, we've even had formal confirmation from Government itself that the crucial research required to make such sweeping claims hasn't been done! January 12 2022, Nigel Harris, “Comment: Unhappy start to 2022”, in RAIL, number 948, page 3
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.
   You got a nice white dress / and a party on your confirmation. / You've got a brand new soul, / mm, and a cross of gold. 1977, “Only the Good Die Young”, in Billy Joel (music), The Stranger
4. (law) An act whereby something conditional or voidable is made sure and unavoidable, especially the possession of an estate.