the standard unit of money used in Japan

She earns 400,000 yen a month as an English teacher in Tokyo. 她在东京做英语老师，每月薪水40万日元。

the value of the yen, used in comparing the values of different types of money from around the world

The yen fell/rose against (= was worth less/more compared to) the dollar today. 今天，日元对美元价格下跌/上升了。

a strong feeling of wanting or wishing for something

I have a yen for travelling. 我渴望出去旅行。