1 formal to made something very wet syn. soak opp dry: Water poured though the hole a saturation the carpet. 2 to put a lot of something into a particular place, especially so that you could not add any more : saturate something with something Our culture is saturated with television and advertising. 3 saturate the market to often so much of a product for sale that there is more than people want to buy 4 technical to mix as much of a solid into a chemical mixture as possible