supposal
/səˈpəʊzl/noun
1The action of supposing something, supposition. Formerly often in on (also †upon) supposal of (also †that). Also parenthetically, †by (also upon) supposal: as may be supposed, supposedly ( obsolete ).
2Something supposed; a supposition, a hypothesis, a conjecture; an assumption.
- †by supposals: as may be supposed, supposedly (obsolete )..
3A notion, an opinion. Now rare.
Origin
Late Middle English; earliest use found in John Wyclif (d. 1384), theologian, philosopher, and religious reformer. From Anglo-Norman supposaille, supposail, supposaile mere supposition, (in law) a supposition, something presupposed to be true from supposer + -aille, -ail.