LATIN DICTIONARYLexicon Latīnum
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“certainness, certainty” in Latin

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

certainness, certainty
fides (trustworthiness): certa fides: firmitas: stabilitas (fixedness, steadiness): or, by adjective, certus, exploratus, non dubius (certitudo must be avoided). A CERTAINTY, res exploratae veritatis: res certissima: the full or absolute certainty, veritas ad liquidum explorata. For “with certainty,” Vid: CERTAINLY.

Quick answer

What is the Latin word for certainness, certainty?
The usual Latin words for “certainness, certainty” are fidēs, firmitās, stabiliō; also certus, explōrō. 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.