Definitions

1. noun

a thing added to something else in order to make it complete or more useful

“She found a supplement to her income by writing articles online.”

2. verb

to add something to something else in order to make it complete or more useful

“He will supplement his diet with vitamins and minerals to stay healthy.”

3. verb

to provide something that completes or adds to something else, especially food or drink

“The charity supplements the income of low-income families.”

4. noun

something that provides additional information or support

“The manual is a supplement to the online course materials.”