LATIN DICTIONARYLexicon Latīnum
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“guarantee” in Latin

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

guarantee
Security for the due performance of stipulations, etc., satisdatio (the pledging one’s self, especially by giving a sum of money as security): fidei jussio (Jurisconsulti, the giving security for anybody; he was asked, id fide tua esse jubes? Ulp., Dig., 45, 1, 75, §6): verbal guarantees, satisdationes secundum mancipium (Cic., Att., 5, 1; i. e., only promises).
Person who gives the guarantee, cautor (general term): sponsor: vas [SYN. in SURETY]: fidejussor: confirmator (only in pecuniary cases; ☞ Cic., Cluent., 26, 77): to be anybody’s guarantee for a large amount, intercedere pro aliquo magnam pecuniam (Cic.).

Quick answer

What is the Latin word for guarantee?
The usual Latin words for “guarantee” are satisdatiō, iūriscōnsultus, cautor; also spōnsor, vās, fidēiussor. 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.