supposal

noun

1. (countable, uncountable)The act of supposing; supposition.
2. (countable, uncountable)Something supposed; a supposition, a hypothesis.

   “[W]e may, if we attentively consider and examine it, find that there are circumstances sufficient, upon the supposals of the excellent contrivance of their machine, to excite and force them to act after such or such a manner […].”

   “Interest, with a Jew, never proceeds but upon supposal, at least, of a firm and sufficient bottom.”