1. to confirm or attest officially that something is true or meets certain standards
Usage: third person singular present tense of ‘certify’
2. to guarantee or declare that someone is qualified or competent
Usage: often used in professional or educational contexts

Examples

• The doctor certifies that the patient is fit to return to work.
• This document certifies that she completed the training program.
• The inspector certifies that the building meets safety codes.
• The organization certifies teachers in special education.
• A notary public certifies the authenticity of signatures.
• The lab certifies that the water is safe to drink.