verb (used without object), testified, testifying.
to bear witness; give or afford evidence.
Law. to give testimony under oath or solemn affirmation, usually in court.
to make solemn declaration.
verb (used with object), testified, testifying.
to bear witness to; affirm as fact or truth; attest.
to give or afford evidence of in any manner.
Law. to state or declare under oath or affirmation, usually in court.
to declare, profess, or acknowledge openly.

1350–1400; Middle English testifyen < Latin testificārī to bear witness, equivalent to testi(s) witness + -ficārī -fy

testifier, noun
pretestify, verb (used with object), pretestified, pretestifying.
retestify, verb, retestified, retestifying.
untestifying, adjective

5. indicate, show, signify, prove.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
testify (ˈtɛstɪˌfaɪ)
vb (when intr, often foll by to) , -fies, -fying, -fied
1.  (when tr, may take a clause as object) to state (something) formally as a declaration of fact: I testify that I know nothing about him
2.  law to declare or give (evidence) under oath, esp in court
3.  to be evidence (of); serve as witness (to): the money testified to his good faith
4.  (tr) to declare or acknowledge openly
[C14: from Latin testificārī, from testis witness]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., "to serve as evidence of," from L. testificari "bear witness," from testis "witness" (see testament) + root of facere "to make" (see factitious). Biblical sense of "openly profess one's faith and devotion" is attested from 1520s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The stakes are high for the newspaper editors who testified this week.
His treatment testified to a new high-handedness in the handling of dissidents, several of whom have simply disappeared.
Not only did he not crack or pay up, he testified in court.
King himself testified that he had initially resisted because he was afraid the arrest would result in a probation violation.
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