Supposal

n.

1.

The act of supposing; also, that which is supposed; supposition; opinion. Interest, with a Jew, never proceeds but upon supposal, at least, of a firm and sufficient bottom. - South.

Noun	1.	supposal - a hypothesis that is taken for granted; "any society is built upon certain assumptions" Synonyms: assumption, supposition
	2.	supposal - the cognitive process of supposing Synonyms: supposition

assumption, base, basic assumption, basis, conclusion, constatation, cornerstone, foundation, fundament, given, groundwork, hypothesis, possibility, precondition, presumption, say, self-evident truth, suppose, supposition, theory