Also means
certified letter
Usage Note
Certificado is both a noun (a certificate or official document) and a past participle used as an adjective: correo certificado (registered mail). Common compound terms include certificado médico (medical certificate) and certificado de nacimiento (birth certificate). As an adjective, the feminine form is certificada.
Examples
"Necesitas un certificado médico para inscribirte."
Natural Translation
You need a medical certificate to register.

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