LATIN DICTIONARYLexicon Latīnum
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“evidence” in Latin

The English word evidence itself goes back to Latin videō, through evidentia.

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

evidence v.
testimonio esse: planum facere (make it clear). Vid: PROVE.
evidence
testimonium: oral evidence, testimonium vocis: to give evidence, testimonium dicere; about anything, de aliqua re; against anybody, in aliquem: to refute evidence, testimonium refellere: to be an evidence, testimonio esse: to give evidence about anything, testimonium alicujus rei dare or reddere: to be or serve for an evidence of anything, alicui rei testimonium dare (of persons and things); alicujus rei esse testimonium (of things): it may serve for an evidence of it, that, etc., ejus rei esse testimonium, quod, etc.; rem esse testimonio, quod, etc.: to quote an evidence for anything, testimonium alicujus rei proferre: to produce an evidence of anything, alicujus rei testimonium afferre (e.g., laboris sui periculique, Caes., of a soldier who produced his shield): to give an important evidence in favor of anybody, grave testimonium alicui impertire (Cic., Fam., 5, 12, 7): to confirm by evidence, testimonio confirmare aliquid: to give a false evidence, falsum testimonium dicere or praebere. Circumstantial evidence, Vid. CIRCUMSTANTIAL, and add multa (plura or plurima) signa concurrentia (after Auct. ad Herenn.), and: to convict anybody on circumstantial evidence, argumentorum or testimoniorum, quae per se nihil reum aggravare videantur, congregatione alicujus factum convincere (after Quint., 5, 7, 18): to hesitate and prevaricate in giving his evidence, titubare, inconstanter loqui (ad Herenn.).
To turn king’s evidence, indicium profiteri (general term): *de aliqua re, fide regia data indicare: to offer to turn king’s evidence, dicere se de re indicaturum, si fides publica data esset (or sit, Sall., Cat., 48, 4). ☞ Testis (witness) is often used for “evidence.” By what evidence will you convict me? quo me teste convinces? I attach more weight to arguments than to evidence, apud me plus argumenta valent, quam testes. Things for which we have the evidence of our senses, quae sensibus percipiuntur; quae omnem sibi fidem sensibus confirmant, id est, incorruptis atque integris testibus (Cic.): ☞ evidentia is used with perspicuitas by Cic. as a translation of the Greek ἐνάργεια (lucid statement), = “res - clare, atque ut cerni videantur, enuntiare.”

Quick answer

What is the Latin word for evidence?
The usual Latin words for “evidence” are testimōnium, reddō. 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.