LATIN DICTIONARYLexicon Latīnum
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“credibility” in Latin

The English word credibility itself goes back to Latin crēdō, through credibilitas.

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

credibility
fides: auctoritas (the credibility it derives from a sufficient voucher): probabilitas (Cic., 4 Acad., 75 = verisimilitudo): to establish the credibility of anything, credibile aliquid facere; fidem alicui rei facere, addere, or afferre (of things that cause anything to be believed): to prove the credibility of anything to anybody’s satisfaction, alicui aliquid or de aliqua re probare [☞ not credibile aliquid alicui facere, though credibile aliquid facere is correct, Krebs]: the supposed credibility of dreams is done away with, tollitur auctoritas somniorum (Cic.): not to overstep the bounds of credibility in anything, veritatis fidem servare in re: to lose their credibility, fidem amittere (of words, etc.).

Quick answer

What is the Latin word for credibility?
The usual Latin words for “credibility” are fidēs, auctōritās, probābilitās; also addō, afferō. 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.