The Collaborative International Dictionary of English v.0.48:
detente \detente\ (d[asl]*t[aum]nt"), n. the easing of tensions or strained relations (especially between nations), as by agreement, negotiation, or tacit understandings. [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
detente n 1: the easing of tensions or strained relations (especially between nations)