LATIN DICTIONARYLexicon Latīnum
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“witness” in Latin

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

witness s.
Testimony, testimonium. To bear witness, testem esse; testimonium dicere; pro testimonio dicere; testari; testiricari: to bear false witness, falsum testimonium dicere or praebere: the very words bear witness to the fact, ejus rei ipsa verba testimonio sunt: to call to witness, testari aliquem; testem facere aliquem; God, Deum testari or Deum invocare testem; gods and men, deos hominesque testari or contestari: antestari aliquem (in legal matters, before the introduction of a cause into court. The question put was, licet antestari? If the party consented, the person appealing to him touched the tip of his ear. In non-judicial matters it occurs only in Cic. pro Milone, 25, 68).
One who bears, testimony, testis. To call a witness, testem citare: to bring a witness, testem producere: to call a witness to prove, testem citare or vocare in testimonium alicujus rei.
witness v.
To attest, testari (general term): attestari: testificari: testimonio confirmare (confirm by one’s evidence): testimonio esse: testem esse (to be a witness; the former of things, the latter of persons): affirmare (to affirm positively): clamare (to cry out).
To see, observe, Vid.

Quick answer

What is the Latin word for witness?
The usual Latin words for “witness” are testimōnium, testis, testor; also praebeō, attestor, testificor. 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.