[ tes-tuh-fahy ]
/ ˈtɛs təˌfaɪ /

verb (used without object), tes·ti·fied, tes·ti·fy·ing.

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), tes·ti·fied, tes·ti·fy·ing.

Origin of testify

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

Related forms

tes·ti·fi·er, nounpre·tes·ti·fy, verb (used with object), pre·tes·ti·fied, pre·tes·ti·fy·ing.re·tes·ti·fy, verb, re·tes·ti·fied, re·tes·ti·fy·ing.un·tes·ti·fy·ing, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for testify

British Dictionary definitions for testify


/ (ˈtɛstɪˌfaɪ) /

verb -fies, -fying or -fied

(when tr, may take a clause as object) to state (something) formally as a declaration of factI testify that I know nothing about him
law to declare or give (evidence) under oath, esp in court
(when intr, often foll by to) to be evidence (of); serve as witness (to)the money testified to his good faith
(tr) to declare or acknowledge openly

Derived Forms

testification, nountestifier, noun

Word Origin for testify

C14: from Latin testificārī, from testis 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