correspondence
/ˌkɒrɪˈspɒndəns/noun
1
- a close similarity, connection, or equivalence类似; 关系, 联系; 相当：
there is a simple correspondence between the distance of a focused object from the eye and the size of its image on the retina.
所聚焦物体离眼睛的远近和在视网膜上成像大小之间的关系很简单。
2
- mass noun communication by exchanging letters with someone通信, 通信联系：
the organization engaged in detailed correspondence with local MPs.
该组织事无巨细都与地方下院议员通信联系。
2.1
- letters sent or received信函; 信件：
his wife dealt with his private correspondence.
他妻子处理他的私人信件。
词源
late Middle English: via Old French from medieval Latin correspondentia, from correspondent- 'corresponding' （see CORRESPONDENT）.