A person or organization that officially certifies, verifies, or confirms that something meets certain standards or is genuine.
From 'certify' plus the agent suffix '-er' (from Old English), creating a noun for 'one who certifies.' The '-er' suffix is more casual than '-or'.
A 'certifier' might be a government agency, an auditor, or a professional body—they carry the legal and moral weight of their reputation because their certification directly affects people's trust and safety.
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