[ 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


tes·ti·fi·er, noun pre·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

Example sentences 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 fact I 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 of testify

testification, noun testifier, noun

Word Origin for testify

C14: from Latin testificārī, from testis witness