dilute (third-person singular simple present dilutes, present participle diluting, simple past and past participle diluted) (transitive) To make thinner by adding solvent to a solution, especially by adding water. Learn what dilution means in science, how the concentration formula works, and where dilution shows up in labs, medicine, and everyday life. The meaning of DILUTE is attenuate. How to use dilute in a sentence. Understanding dilute more deeply opens up new ways to describe situations and ideas. Remember, whether you’re watering down a solution or softening a critique, knowing the right usage can make your language more precise and engaging. Define dilute. dilute synonyms, dilute pronunciation, dilute translation, English dictionary definition of dilute. tr.v. di·lut·ed , di·lut·ing , di·lutes 1. To make thinner or less concentrated by adding a liquid such as water. 2. To lessen the force, strength, purity. DILUTE meaning: 1. to make a liquid weaker by mixing in something else: 2. to reduce the strength of a feeling…. Learn more. DILUTE definition: 1. to make a liquid weaker by mixing in something else: 2. to reduce the strength of a feeling…. Learn more. When you dilute something, you make it thinner, weaker, or more watered down. If you put lots of ice cubes in your soda, the ice will melt and dilute the drink. DILUTE definition: to make (a liquid) thinner or weaker by the addition of water or the like. See examples of dilute used in a sentence. The meaning of DILUTED is weakened or thinned by or as if by having been mixed with something else (such as water). How to use diluted in a sentence.