define "Supposition"

sup·po·si·tion

ˌsəpəˈziSH(ə)n/

noun

noun: supposition; plural noun: suppositions

1. an uncertain belief.

   "they were working on the supposition that his death was murder"

   synonyms:

   belief, surmise, idea, notion, suspicion, conjecture, speculation, inference, theory, hypothesis, postulation, guess, feeling, hunch, assumption, presumption "her supposition is based on previous results"

Origin

late Middle English (as a term in scholastic logic): from Old French, or from late Latin suppositio(n-) (translating Greek hupothesis ‘hypothesis’), from the verb supponere (see suppose).

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Supposition | Definition of Supposition by Merriam-Webster

https://www.merriam-webster.com/dictionary/supposition

Definition of supposition. 1 :something that is supposed :hypothesis. 2 :the act of supposing.