LATIN DICTIONARYLexicon Latīnum
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“suppose” in Latin

The English word suppose itself goes back to Latin pōnō, through supponere.

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

suppose
To imagine, think, arbitrari: putare: videri with an infinitive, or mihi videtur aliquid: opinari: reri: animum or in animum inducere: existimare: ducere. [SYN. and PHR. in BELIEVE].
To require as previous, ponere, facere, rem esse. Fac = suppose for a moment (of an improbable supposition). Suppose that the soul does not remain after death, fac animos non remanere post mortem: suppose that you could, fac potuisse. For “supposing that,” “even supposing that,” Vid: “granting,” “even granting that,” in GRANT.

Quick answer

What is the Latin word for suppose?
The usual Latin words for “suppose” are arbitror, putō, videō; also opīnor, reor, animus. 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.