Ho, no, no, no, no: my meaning in saying he is a good man is to have you understand me that he is sufficient; yet his means are in supposition: he hath an argosy bound to Tripolis, another to the Indies; I understand, moreover, upon the Rialto, he hath a third at Mexico, a fourth for England, and other ventures he hath, squandered abroad.
There are no more uses of "supposition" in the play.
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It is a foolish supposition.
She paints a vivid picture, but we must remember it is all mere supposition.