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certify
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As a verb, certify means attest to (a fact) as the truth.
Meanings of certify
10 meaningsverb
To attest to (a fact) as the truth.
legalTo authenticate or verify in writing.
To attest that a product, service, organization, or person has met an official standard.
“These blankets have been certified as fireproof.”
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”
Similar: attest, manifest, demonstrate, evidenceGuarantee payment on; of checks
Declare legally insane
Older and rare meanings (2)
archaicTo inform; to tell (a person) that something is true.
archaicTo assure (oneself) of something; to ascertain.
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).