Definition of: attest

(ə·test′) v.t.
1. To confirm as accurate, true, or genuine; vouch for.
2. To certify, as by signature or oath.
3. To be proof of: His many works attest his industry.
4. To put upon oath.
—v.i.
5. To bear witness; testify: with to.
—noun One who or that which certifies or confirms; attestation. [<F attester <L attestari confirm < ad- to + testari bear witness]