Definition of testify

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tes·ti·fy    (tst-f) KEY 

VERB:
test·i·fied, test·i·fy·ing, test·i·fies
VERB:
intr.

1. To make a declaration of truth or fact under oath; submit testimony: witnesses testifying before a grand jury.
2. To express or declare a strong belief, especially to make a declaration of faith.
3. To make a statement based on personal knowledge in support of an asserted fact; bear witness: the exhilaration of weightlessness, to which many astronauts have testified.
4. To serve as evidence: wreckage that testifies to the ferocity of the storm.

VERB:
tr.

1. To declare publicly; make known: testifying their faith.
2. To state or affirm under oath: testified in court that he saw the defendant.
3. To bear witness to; provide evidence for. See Synonyms at indicate.

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ETYMOLOGY:
Middle English testifien, from Latin testificr : testis, witness; see trei- in Indo-European roots + -ficr, -fy

OTHER FORMS:
testi·fi·cation  (-f-kshn) KEY (Noun), testi·fier(Noun)