attest

Verb
  1. Provide evidence for;
    Stand as proof of;
    Show by one's behavior, attitude, or external attributes (synset 200822637)
    "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"
  2. Authenticate, affirm to be true, genuine, or correct, as in an official capacity (synset 200822013)
    "I attest this signature"
  3. Give testimony in a court of law (synset 201016830)
  4. Establish or verify the usage of (synset 200822272)
    "This word is not attested until 1993"

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