I walked through the streets; and, once more seeing my old adversary the butcher — now a constable, with his staff hanging up in the shop — went down to look at the place where I had fought him; and there meditated on Miss Shepherd and the eldest Miss Larkins, and all the idle loves and likings, and dislikings, of that time.
There are no more uses of "adversary" in the book.
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Then, again, our military training is in many respects superior to that of our adversaries.
Thucydides -- Pericles’s Funeral Oration
Finally, it was rumored, there would be complete information-sharing among all of these previously disconnected and even adversarial entities, and when they were coordinated, and once all the health data they’d collected was shared, most of this made possible through the Circle and more important, TruYou, viruses could be stopped at their sources, diseases would be tracked to their roots.