Nickel/ˈnɪkl/ Definition 1 of 4Pro Tip 1/2U.S. Currency Used when dealing with money in the United States, especially in small amounts. The vending machine only accepts nickels and dimes. Pro Tip 2/2Small Change It might refer to something of little significance or value in everyday language. Losing that deal was just nickel and dime stuff in the big picture.