1. a person or organization that certifies or officially confirms the authenticity, quality, or compliance of something

Examples

• The certifier verified that the software met all industry standards.
• An independent certifier inspected the building to ensure it was earthquake-safe.
• The certifier issued a certificate of authenticity for the artwork.
• Our company hired a third-party certifier to audit our environmental practices.
• The certifier confirmed that the organic farm met all regulatory requirements.
• A professional certifier examined the diamonds before they were sold.