It would be a great mistake to suppose that Dorothea would have cared about any share in Mr. Casaubon’s learning as mere accomplishment; for though opinion in the neighborhood of Freshitt and Tipton had pronounced her clever, that epithet would not have described her to circles in whose more precise vocabulary cleverness implies mere aptitude for knowing and doing, apart from character.
Lydgate, who had the muscular aptitude for billiards, and was fond of the game, had once or twice in the early days after his arrival in Middlemarch taken his turn with the cue at the Green Dragon; but afterwards he had no leisure for the game, and no inclination for the socialities there.
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.