Mr. Macalister, the widower, had desired to make a marriage of reason, and had chosen Catherine for what he supposed to be her latent matronly qualities; but John Ludlow, who was a year the girl’s junior, and spoken of always as a young man who might have his "pick," was seriously in love with her.
There are no more uses of "latent" in the book.
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She is unschooled, but I think she has latent talent as an engineer.
A latent HPV infection reactivated when her immune system weakened with age.