Also means
to attest
Usage Note
Certificar means to formally certify or attest to a fact, used in legal, academic, and postal contexts: certificar un documento, carta certificada (registered letter). The noun is certificado (certificate). In Spain, sending something certificado at the post office means sending it by registered mail.
Examples
"El notario certificó la firma del contrato."
Natural Translation
The notary certified the contract signature.

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