Ada looked so very anxious now that I asked Mrs. Badger on what she founded her supposition.
If you entertain the supposition that any real success, in great things or in small, ever was or could be, ever will or can be, wrested from Fortune by fits and starts, leave that wrong idea here or leave your cousin Ada here.
There are no more uses of "supposition" in the book.
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It is a foolish supposition.
She paints a vivid picture, but we must remember it is all mere supposition.