attest

play

verb at·test \ə-ˈtest\

Simple Definition of attest

: to show, prove, or state that something is true or real

Source: Merriam-Webster's Learner's Dictionary

Full Definition of attest

transitive verb
1 a : to affirm to be true or genuine; specifically : to authenticate by signing as a witness b : to authenticate officially
2 : to establish or verify the usage of
3 : to be proof of : manifest <her record attests her integrity>
4 : to put on oath
intransitive verb
: to bear witness : testify <attest to a belief>

attestation

play \ˌa-ˌtes-ˈtā-shən, ˌa-tə-ˈstā-\ noun

attester

play \ə-ˈtes-tər\ noun

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Examples of attest in a sentence

I can attest that what he has said is true.
The certificate attests the authenticity of the painting.

Origin and Etymology of attest

Middle French attester, from Latin attestari, from ad- + testis witness — more at testament

First Known Use: circa 1500

Synonym Discussion of attest

certify, attest, witness, vouch mean to testify to the truth or genuineness of something. certify usually applies to a written statement, especially one carrying a signature or seal <certified that the candidate had met all requirements>. attest applies to oral or written testimony usually from experts or witnesses <attested to the authenticity of the document>. witness applies to the subscribing of one's own name to a document as evidence of its genuineness <witnessed the signing of the will>. vouch applies to one who testifies as a competent authority or a reliable person <willing to vouch for her integrity>.