verb (used with object)

to bear witness to; certify; declare to be correct, true, or genuine; declare the truth of, in words or writing, especially affirm in an official capacity: to attest the truth of a statement.
to give proof or evidence of; manifest: His works attest his industry.
to put on oath.

verb (used without object)

to testify or bear witness (often followed by to): to attest to the reliability of an employee.


Archaic. witness; testimony; attestation.

Origin of attest

1590–1600; (< Middle French attester) < Latin attestārī to bear witness to, equivalent to at- at- + testārī (test(is) a witness + -ā- thematic vowel + -rī infinitive suffix)
Related formsat·test·a·ble, adjectiveat·test·ant, nounat·test·er, at·tes·tor, at·tes·ta·tor [uh-tes-tey-ter, at-e-stey-] /əˈtɛs teɪ tər, ˈæt ɛˌsteɪ-/, nounat·tes·tive, adjectivere·at·test, verb (used with object)un·at·test·ed, adjectivewell-at·test·ed, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for attest

Contemporary Examples of attest

Historical Examples of attest

  • Nor is there any year of his life when his work does not attest a clear eye and a firm hand.


    Beatrice Fortescue

  • And thus it long remained, as if to attest the true level of Holbein's genius.


    Beatrice Fortescue

  • But come, let us attest the gods; for they will be the best witnesses and observers of agreements.

  • The sympathy was largely genuine, as Hartley could attest, but it bored the invalid.

    Wayside Courtships

    Hamlin Garland

  • All attest that in Dreamland there is no such thing as repose.

British Dictionary definitions for attest



(tr) to affirm the correctness or truth of
(when intr, usually foll by to) to witness (an act, event, etc) or bear witness to (an act, event, etc) as by signature or oath
(tr) to make evident; demonstratehis life of luxury attests his wealth
(tr) to provide evidence forthe marks in the ground attested the presence of a fossil
Derived Formsattestable, adjectiveattestant, attester, esp law attestor or attestator, nounattestation (ˌætɛˈsteɪʃən), noun

Word Origin for attest

C16: from Latin attestārī to prove, from testārī to bear witness, from testis a witness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for attest

1590s, from Middle French attester (Old French atester, 13c.) "affirm, attest," from Latin attestari "confirm," literally "bear witness to," from ad- "to" (see ad-) + testari "bear witness," from testis "witness" (see testament). Related: Attested; attesting.

Online Etymology Dictionary, © 2010 Douglas Harper