"Confirmatory" is a word in ENGLISH

confirmatory ENGLISH
Definition:

Serving to confirm; corroborative.

confirmatory ENGLISH
Definition:

Pertaining to the rite of confirmation.

Few words of positivity

Every act of communication is a miracle of translation.

Ken Liu, The Paper Menagerie and Other Stories

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verificative ENGLISH

Serving to verify; verifying; authenciating; confirming.

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voucher ENGLISH

A book, paper, or document which serves to vouch the truth of accounts, or to confirm and establish facts of …

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