certify
verb
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
“His high fever attested to his illness”
“The buildings in Rome manifest a high level of architectural sophistication”
guarantee payment on; of checks
authorize officially
“I am licensed to practice law in this state”
Oppositesdecertifyguarantee as meeting a certain standard
“certified grade AAA meat”
declare legally insane
Source: WordNet 3.1, Princeton University
