If they showed no aptitude for any of these trades, they became field hands and, in the opinion of the negroes, they had lost their claim to any social standing at all.
He found poker the most useful of all Southern customs, poker and a steady head for whisky; and it was his natural aptitude for cards and amber liquor that brought to Gerald two of his three most prized possessions, his valet and his plantation.
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.