intercourse

1. N-UNCOUNT Intercourse is the act of having sex. 性交[正式]

...sexual intercourse. …性交。

2. N-UNCOUNT Social intercourse is communication between people as they spend time together. 交際[老式]

There was social intercourse between the old and the young. 老年人和年輕人之間有社會(huì)交往。