certificate

document that certifies something

Root

cert: sure, settled, made certain

Other words with the cert root

ascertain: to find out or make certain
certain: sure; not in doubt
certainty: sureness
certification: official confirmation or credential
certified: officially confirmed or qualified
certify: to confirm officially as true
certitude: complete certainty

A certificate is paper certainty: proof someone can point to.

The certificate proved she had completed the safety course.

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