Having official qualifications, certificates, or credentials that prove someone's knowledge, training, or authority in a particular field.
From 'credential' (a document proving qualifications), from Medieval Latin 'credentialis' (giving credit), ultimately from Latin 'credere' (to believe). The suffix '-ed' marks the adjective form.
It's fascinating that 'credential' originally meant 'something that makes you believable'—if you had credentials, people would believe you were qualified, making the word fundamentally about trust and authority!
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