dilution

noun | \ dī-ˈlü-shən, də- \ | di·lu·tion

1. : a lessening of real value (as of equity) by a decrease in relative worth; specifically : a decrease of the value per share of common stock caused by an increase in the total number of shares : a decrease of the value per share of common stock caused by an increase in the total number of shares

2. : a lessening of the value of a trademark that is caused by use of the mark by another and that creates potential confusion on the part of the consumer

3. : a weakening of the voting rights of a group of citizens (as a minority) because the representatives they elect have no greater legislative power than the representatives elected by smaller voting groups