LATIN DICTIONARYLexicon Latīnum
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“affidavit” in Latin

The English word affidavit itself goes back to Latin fīdō, through affidavit.

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

affidavit
no exactly corresponding term: prps., testimonium (as opposed to testis or praesens testis) or testimonium recitatum (“testimonia quae recitari solent,” Callistratus, Dig.): [*testimonium affirmate (= cum jurejurando) scriptum (?) or *consignatum litteris testimonium (?)]. Sometimes jusjurandum only, or *fides jurejurando data. To make affidavit, *affirmate scribere (?) with accusative and infinitive: jurare; jurejurando firmare.

Quick answer

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