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plural détentes
(chiefly politics) A relaxing of tension, especially between countries. quotations examples
Analogous structural and political constraints stood in the way of a lasting détente between Germany and Britain.
2012, Christopher Clark, The Sleepwalkers, Penguin, published 2013, page 318
No step the United States could take anywhere in the world would bring strategic benefits as great as detente with Iran.
2014 January 14, Stephen Kinzer, “Invading Iraq was dumb enough. Now Congress wants to derail the Iran deal”, in The Guardian