LATIN DICTIONARYLexicon Latīnum
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“swear” in Latin

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

swear
Intransitively. To take an oath, jurare: jusjurandum jurare or dare (that; accusative with infinitive). To swear to anything, jurejurando firmare (to confirm by oath): jurare aliquid or with accusative and infinitive (to swear that a thing really is so; e.g., morbum, to swear that a person is sick, to swear to a sickness): adjurare, followed by accusative and infinitive (to assure upon oath that a thing is or is not so, that one will or will not do anything): jurare in aliquid (to lay an oath upon anything; e.g., in litem; i. e., to swear that a person is really indebted to one, to swear to one’s accusation; but especially to bind one’s self by oath to anything, to undertake upon oath; e.g., in foedus, in legem): I swear (as a witness) to evidence, juro testimonium dicens: I can swear to it with good conscience, liquet mihi jurare: I will swear to it that, etc., dabo jusjurandum.
To use profane language, diras, impias voces edere: to curse and swear, *maledicere alicui: aliquem exsecrari, et diras, impias voces, dira verba, diras exclamationes addere.
Transitively. To put upon oath, jurejurando or jusjurandum, or ad jusjurandum aliquem adigere; jusjurandum ab aliquo exigere (general terms): aliquem sacramento rogare or adigere (a soldier). Sworn, juratus. A swearing or swearing in, adactio jusjurandi (Liv., 22, 38).

Quick answer

What is the Latin word for swear?
The usual Latin words for “swear” are iūrō, dīrus, iūs iūrandum; also adigō, morbus, adiūrō. 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.