Victor, be assured that your cousin and playmate has too sincere a love for you not to be made miserable by this supposition.
Their first supposition was that it was the corpse of some person who had been drowned and was thrown on shore by the waves, but on examination they found that the clothes were not wet and even that the body was not then cold.
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.