reciprocity
/ˌresɪˈprɒsətɪ/noun
mass noun
- the practice of exchanging things with others for mutual benefit, especially privileges granted by one country or organization to another（尤指国家、组织之间在利益上、特权上的）互给; 互换; 互惠; 对等。
词源
mid 18th cent.: from French réciprocité, from réciproque, from Latin reciprocus'moving backwards and forwards' （see RECIPROCATE）.