D defs.my
Entry 1 sense Webster, 1913

Supposal

· Sup·pos·al · IPA /səˈpəʊzəl/
01 n. The act of supposing; also, that which is supposed; supposition; opinion.
  1. 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.