She found him, however, perfectly the gentleman in his behaviour to all his visitors, and only occasionally rude to his wife and her mother; she found him very capable of being a pleasant companion, and only prevented from being so always, by too great an aptitude to fancy himself as much superior to people in general, as he must feel himself to be to Mrs. Jennings and Charlotte.
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.