"attest" in the verb sense
1. attest, certify, manifest, demonstrate, evidence
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"
2. attest
authenticate, affirm to be true, genuine, or correct, as in an official capacity
"I attest this signature"
3. testify, attest, take the stand, bear witness
give testimony in a court of law
4. attest
establish or verify the usage of
"This word is not attested until 1993"
Source: WordNet® (An amazing lexical database of English)
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