supposal

There are good, clear explanations of Lewis's ideas about myth, the distinctions he made between the "imaginary" and the "imaginative", or "allegory" and "supposal".

Thus Mr. Sinclare, I concur with his supposal, that such Knowledge is originally from Satan, and perhaps the Effect of some old Inchantment.

Grant the probability, yea, the necessity and certainty of that supposal, “if any man do sin,” yet there is as much certainty of indemnity from sin, as of necessity of falling into sin.

These answers were not enough for them, and "still they urged him with words and supposals."

On the former supposal, of course the play must have been rewritten and greatly improved,—a thing known to have been repeatedly done by the Poet; so that it is nowise unlikely in this case.