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Definition of 'certify'


  1. 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"; "This decision demonstrates his sense of fairness"
       Synonyms: attest manifest demonstrate evidence
  2. guarantee payment on; of checks
  3. authorize officially; "I am licensed to practice law in this state"
       Synonyms: license licence
       Antonyms: decertify derecognize derecognise
  4. guarantee as meeting a certain standard; "certified grade AAA meat"
       Synonyms: endorse indorse
  5. declare legally insane

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