Etymology
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certified (adj.)

"attested by certificate," 1610s, past-participle adjective from certify. Certified public accountant attested from 1896; certified mail from 1955.

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Definitions of certified

certified (adj.)
endorsed authoritatively as having met certain requirements;
a certified public accountant
certified (adj.)
fit to be certified as insane (and treated accordingly);
Synonyms: certifiable
certified (adj.)
holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill;
Synonyms: qualified
From wordnet.princeton.edu