to affirm the truth or existence of (something)
Several witnesses attested that he was perfectly sober
to authenticate (something), esp officially
The testator's intention was attested by the trustees
to be proof of or bear witness to (something)
Her blushes attest her innocence
(often + to) to bear witness to something; to testify to it
The massive sales of her books attest to her popularity
attestation noun
attestable adj
attester noun
attestor noun
[French attester from Latin attestari, from ad- + testis witness]