dilution UK /daɪˈljuːʃən/US /daɪˈluʃən/ noun5 •The process of making something dilute. •The process of bringing in unskilled workers to replace skilled ones, for example during wartime. •Ellipsis of share dilution. •A solution that has had additional solvent, such as water, added to it into order to make it less concentrated. •Ellipsis of trademark dilution. formsdilutions