reciprocity

reciprocity
[ˌrɛsɪˈprɒsɪti]
noun
  1. [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
语源
  1. mid 18th cent.: from French réciprocité, from réciproque, from Latin reciprocus 'moving backwards and forwards' (see reciprocate)
英语宝典
考试词汇表