/ ˌresɪˈprɒsəti; NAmE -ˈprɑːs-/ noun
[ U ] ( formal ) a situation in which two people, countries, etc. provide the same help or advantages to each other
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WORD ORIGIN
mid 18th cent.: from French réciprocité , from réciproque , from Latin reciprocus moving backwards and forwards (based on re- back + pro- forward).