the action of making a liquid weaker by mixing in something else, or a liquid that has been made weaker in this way

The drug's effectiveness is decreased by dilution. 药物的有效性因稀释而降低。

Tests are underway to see whether two dilutions of this vaccine are effective. 正在进行测试以确定这种疫苗的两种稀释液是否有效。

the action of reducing the strength of a feeling, action, etc

a dilution of standards 标准的降低

There was certainly a dilution of team spirit. 团队精神肯定被稀释了。