1 interact (with sb) (used about people) to communicate or mix with sb, especially while you work, play or spend time together （指人）相处，交往: He is studying the way children interact with each other at different ages. 他正在研究不同年纪的儿童与同辈的相互影响。

2 (of two things) to have an effect on each other （两个事物）互相作用 ➔interaction noun [U, C]: interaction (between/with sb/sth): There is a need for greater interaction between the two departments. 这两个部门需要更好地互相配合。