Certify (verb)

1. To formally attest to the truth of something, often by providing a certificate or other documentation.
2. To attest to the qualifications or quality of something.

Origin:

From middle english, from certifier ("to assure, confirm, attest"), from old french certifier, from latin certificare ("to certif.y")

Examples:

1. The organization certified her as a professional in her field.
2. The doctor certified that the patient was fit to return to work.
3. The government certified the election results.
4. The product was certified to be safe for consumption.
5. The official certified the document as a true copy.