While Mary drew, Diana pursued a course of encyclopaedic reading she had (to my awe and amazement) undertaken, and I fagged away at German, he pondered a mystic lore of his own: that of some Eastern tongue, the acquisition of which he thought necessary to his plans.
There are no more uses of "acquisition" in the book.
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From the fifth grade onward, most vocabulary acquisition occurs incidentally while reading.
Her primary focus is on the acquisition of money and the things it can buy.