1. Asserted as true under oath; SYN. avowed.
2. Bearing the signature of a witness attesting to something's legality; SYN. attested to.
3. Established as genuine; SYN. authenticated, documented.
Officially documented; SYN. credentialed, documented.
1. Endorsed authoritatively as having met certain requirements
2. Having quality or payment or delivery guaranteed
3. Holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill; SYN. qualified.