attest

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verb at·test \ə-ˈtest\

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

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>

— at·tes·ta·tion \ˌa-ˌtes-ˈtā-shən, ˌa-tə-ˈstā-\ noun

— at·test·er \ə-ˈtes-tər\ noun

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Examples of ATTEST

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

Origin of ATTEST

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

First Known Use: circa 1500

Related to ATTEST

Synonyms

certify, authenticate, avouch, testify (to), vouch (for), witness

Antonyms

disprove, rebut, refute

Related Words

guarantee, warrant; affirm, assert, aver, avow, profess, vow

Near Antonyms

contradict, gainsay; deny, disavow, disclaim; challenge, contest, dispute, question

See Synonym Discussion at certify