What does testify mean?
Testify means to give evidence, especially by answering questions as a witness in a court. It can also mean to state something formally under oath or, in less formal use, to show or affirm that a fact or condition is true. The wording carries a formal, authoritative tone and is especially associated with legal proceedings, although people may testify to an experience or quality in ordinary conversation. The related noun testify is a legal term for a written statement made under oath; it is less common in everyday use than testimony. To testify is stronger than merely to say: it implies that the speaker is formally vouching for what they state or that the statement has evidentiary force. The word therefore serves both as a precise courtroom verb and as a broader expression of authoritative confirmation.
To give evidence as a witness; to state formally under oath; or, by extension, to affirm or indicate that something is true.
"The witness was asked to testify about the events leading up to the accident."
The sense “give evidence” is most common. Legal use often involves testimony given under oath, while figurative uses indicate that something provides evidence of a fact.
A written statement made under oath and offered as evidence.
"The filing included two testifies from witnesses who were unavailable."
This noun is chiefly used in legal and formal contexts and is less common than the related noun testimony.
The standard plural is testifies. As a countable noun, testify is chiefly used in legal and formal contexts.
"The court admitted two testifies into evidence."
Testify carries a Roman fingerprint: Latin testis means “witness,” so its central idea has always been to bear witness.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does testify come from?
Testify entered Middle English through Old French testifier. It ultimately comes from Latin testificari, “to testify or bear witness,” formed from testis, meaning “witness.” The same root produced cognates including testimony, testimonial, attest, and testament.
Related word forms
How testify is actually used
The verb is formal and especially common in legal contexts, but it is also used figuratively when something provides clear evidence of a fact or condition. There is no major British–US difference in its standard use. The noun is chiefly a legal term and is less common in everyday language than testimony.
Easily confused with testify
Testify is normally a verb meaning to give evidence, whereas testimony is the evidence or statement itself.