dilution
noun /daɪˈluːʃn/
  /daɪˈluːʃn/
- [uncountable, countable] the act of making a liquid weaker by adding water or another liquid to it; a liquid that has been made weaker in this way- the dilution of sewage
 
- [uncountable, singular] the act of making something weaker or less effective- This is a serious dilution of their election promises.