LATIN DICTIONARYLexicon Latīnum
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“presuppose” in Latin

The English word presuppose itself goes back to Latin suppōnō, through praesuppōnō.

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

presuppose
sperare, confidere (to hope): ponere, sumere (to take for granted). ☞ Supponere and praesupponere are barbarous. The decorum necessarily presupposes the honestum; quidquid est id quod deceat, id tum apparet, cum antegressa est honestas.

Quick answer

What is the Latin word for presuppose?
The usual Latin words for “presuppose” are spērō, cōnfīdō, pōnō; also sūmō, honestus. 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.