Definition from Wiktionary, the free dictionary
From Old French, from Latin suppositiō, suppositiōnem (“supposition”), from sub- (“under”) + positiō, positiōnem (“position; theme”), from positus (“position”), from the perfect passive participle of pōnō, pōnere (“put, place”).
- Something that is supposed; an assumption made to account for known facts, conjecture.
- The act or an instance of supposing.
- See also Wikisaurus:supposition