Mrs. Hale glanced at me tentatively, as though trying to see how much footing my conjectures gave her; and I guessed that if she had kept silence till now it was because she had been waiting, through all the years, for some one who should see what she alone had seen.
There are no more uses of "conjecture" in the book.
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She dismissed it as mere conjecture.
It is important to distinguish between conjecture and fact.