LATIN DICTIONARYLexicon Latīnum
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“presumption” in Latin

The English word presumption itself goes back to Latin sūmptus.

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

presumption
Opinion, conjectura; opinio; praesumta opinio (Quint.).
Prima facie probability. This is a point that, etc., this constitutes a point that, etc., ex aliqua re (conjectura) colligere potes, or *colligi posse videtur.
Boldness, daring, audacia; confidentia; temeritas. arrogantia.

Quick answer

What is the Latin word for presumption?
The usual Latin words for “presumption” are coniciō, opīniō, audāx; also cōnfīdō, temeritās, arrogantia. 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.