Well, it was clear to me — and my parents later confessed that it had been obvious to them, too — what my aptitude was.
Probably the one with scientific aptitude was Benjamin, the male who had devised new, important equipment for the Rehabilitation Center.
She mentioned that there was one who had singular skills at caretaking, another who loved newchildren, one with unusual scientific aptitude, and a fourth for whom physical labor was an obvious pleasure.
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.