LATIN DICTIONARYLexicon Latīnum
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“testify” in Latin

The English word testify itself goes back to Latin testis, through testificor.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

testify
testari (general term): attestari: testificari: testimonio confirmare (to establish by a witness): testimonio esse: testem esse (to serve as a witness; the former of a thing, the latter of a person): testificari: affirmare (to affirm, assure).

Quick answer

What is the Latin word for testify?
The usual Latin words for “testify” are testor, attestor, testificor; also affirmō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.