Lily was naturally proud of her mother’s aptitude in this line: she had been brought up in the faith that, whatever it cost, one must have a good cook, and be what Mrs. Bart called "decently dressed."
It could not be that one conscious of such aptitudes for mastery and enjoyment was doomed to a perpetuity of failure; and her mistakes looked easily reparable in the light of her restored self-confidence.
She had learned by experience that she had neither the aptitude nor the moral constancy to remake her life on new lines; to become a worker among workers, and let the world of luxury and pleasure sweep by her unregarded.
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.