attest

Verb

• establish or verify the usage of
  • This word is not attested until 1993
    

• give testimony in a court of law

• authenticate, affirm to be true, genuine, or correct, as in an official capacity
  • I attest this signature
    

• 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
    

Related words

• Synonyms: 
  testify , take the stand , bear witness , certify , manifest , demonstrate , evidence