There was no one whom she liked as much, no one whom she trusted as completely, and the culminating "lark" of the whole delightful adventure of engagement and marriage was to be off with him alone on a journey, like a grownup person, like a "married woman," in fact.
There are no more uses of "culminate" in the book.
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culminated in her defriending him
their achievements stand as a culmination of centuries of development