the act of reducing how harmful, unpleasant, or bad something is

effective mitigation of climate change 有效地减缓气候变化

There has been no significant increase in funding for flood mitigation works. 防洪减灾工事拨款没有明显的增加。

something that causes you to judge a crime to be less serious, or to make a punishment less severe

"I was very young at the time," he said in mitigation. “那时我年纪尚小，”他在减刑陈词中说。

His defence lawyers presented their mitigation plea. 他的辩护律师作了减刑陈词。