He, who had in her opinion such a marked aptitude for a political career, in which he would have been certain to play a leading part—he had sacrificed his ambition for her sake, and never betrayed the slightest regret.
The word talent, by which they meant an inborn, almost physical, aptitude apart from brain and heart, and in which they tried to find an expression for all the artist had gained from life, recurred particularly often in their talk, as though it were necessary for them to sum up what they had no conception of, though they wanted to talk of it.
There are no more uses of "aptitude" in the book.
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Hyde’s study indicates that girls and boys have the same aptitude for math.
Evidently she had great natural aptitude for her work.