LATIN DICTIONARYLexicon Latīnum
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“hypothesis” in Latin

The English word hypothesis itself goes back to Latin hypothesis.

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

hypothesis
Condition, conditio.
Supposition: supposed opinion, ground, etc., opinio (one’s opinion, whether well-founded or not): sententia (opinion declared): conjectura (conjecture): Hypotheses, rationes, quae ex conjectura pendent, quae disputationibus huc illuc trahuntur (Cic., Acad., 2, 36, 116). Untenable hypotheses, sententiae futiles commenticiaeque: to form hypotheses, conjectare; about anything, de re: to rest on a hypothesis, conjectura niti: resting on hypotheses, opinabilis: full of hypotheses, opiniosus.

Quick answer

What is the Latin word for hypothesis?
The usual Latin words for “hypothesis” are conditiō, opīniō, sententia; also coniciō, ratiō, hypothesis. 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.