Also means
to certify
Usage Note
Attester means to attest, certify, or bear witness to something. It is common in legal and administrative contexts: attester que (to certify that) + indicative. The related noun attestation (f) refers to an official certificate or letter of proof, a document frequently required in French bureaucracy.
Examples
"Ce document atteste de son niveau de français."
Natural Translation
This document certifies her level of French.

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