at·test

[uh-test]
verb (used with object)
1.
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.
2.
to give proof or evidence of; manifest: His works attest his industry.
3.
to put on oath.
verb (used without object)
4.
to testify or bear witness (often followed by to ): to attest to the reliability of an employee.
noun
5.
Archaic. witness; testimony; attestation.

Origin:
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)

at·test·a·ble, adjective
at·test·ant, noun
at·test·er, at·tes·tor, at·tes·ta·tor [uh-tes-tey-ter, at-e-stey-] , noun
at·tes·tive, adjective
re·at·test, verb (used with object)
un·at·test·ed, adjective
well-at·test·ed, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Attested is always a great word to know.
So is ninnyhammer. Does it mean:
the offspring of a zebra and a donkey.
a fool or simpleton; ninny.
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World English Dictionary
attest (əˈtɛst) [Click for IPA pronunciation guide]
 
vb (when intr, usually foll by to)
1.  (tr) to affirm the correctness or truth of
2.  to witness (an act, event, etc) or bear witness to (an act, event, etc) as by signature or oath
3.  (tr) to make evident; demonstrate: his life of luxury attests his wealth
4.  (tr) to provide evidence for: the marks in the ground attested the presence of a fossil
 
[C16: from Latin attestārī to prove, from testārī to bear witness, from testis a witness]
 
at'testable
 
adj
 
at'testant
 
n
 
at'tester
 
n
 
at'testor
 
n
 
at'testator
 
n
 
attestation
 
n

attested (əˈtɛstɪd) [Click for IPA pronunciation guide]
 
adj
(Brit) (of cattle, etc) certified to be free from a disease, esp from tuberculosis

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

attest
1540s, from M.Fr. attester, from O.Fr. atester (13c.) "affirm, attest," from L. attestari "confirm," lit. "bear witness to," from ad- "to" + testari "bear witness," from testis "witness" (see testament).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
Their superiority to central planning is well attested.
As the scattered rock stars in the audience might have attested, you can't get
  any cooler than that.
The same was attested by others to whom the saint had discovered this signal
  favour.
Registrants who mail in their properly attested registration statement will
  receive a certificate of registration by mail.
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