Entry 2 senses Webster, 1913

Confirmatory

/kən-fẽrm'-ət-ôrˌ-ē/ · Con·firm·a·to·ry · IPA /kənˈfɝ.məˌtoɹ.i/

01 a. Serving to confirm; corroborative.

1.
Serving to confirm; corroborative.
“A fact confirmatory of the conclusion.” — I. Taylor.
2.
Pertaining to the rite of confirmation.