|Origin:||supplementum, from supplere; SUPPLY2|
something that you add to something else to improve it or make it complete:
vitamins and other dietary supplements
The payments are a supplement to his usual salary.
an additional part at the end of a book, or a separate part of a newspaper, magazine etc:
the Sunday supplements
an amount of money that is added to the price of a service, hotel room etc:
Single rooms are available at a supplement.