certified
adj.-
1 officially qualified (adj.) B2 Upper Intermediatehaving a document that proves you have the skills or training for a job.
having been issued a certificate or license that confirms professional competence or qualification.
ExampleYou should only hire a certified electrician to fix the wiring in your house.
ExampleThe hospital requires all nursing staff to be certified in advanced life support before they can work in the intensive care unit.
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2 verified or authentic (adj.) B2 Upper Intermediateofficially checked and confirmed to be true or of high quality.
guaranteed as meeting a specific standard or being genuine through a formal process of verification.
ExampleThe shop sells certified organic vegetables that are grown without chemicals.
ExampleThe accountant provided a certified copy of the financial statement to ensure the investors that the figures were accurate.