It is possible to understand that Napoleon had power and so events occurred; with some effort one may even conceive that Napoleon together with other influences was the cause of an event; but how a book, Le Contrat social, had the effect of making Frenchmen begin to drown one another cannot be understood without an explanation of the causal nexus of this new force with the event.
There are no more uses of "nexus" in the book.
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The conflict is complicated by Afghanistan’s opium-terrorism nexus.
Silicon Valley is the nexus of technology and innovation.