1. something added to complete or enhance something else
2. a pill or capsule containing vitamins, minerals, or other nutrients
3. an additional section added to a newspaper, magazine, or book

1. to add something extra to complete or enhance

Examples

• She takes a calcium supplement every morning.
• The Sunday newspaper includes a sports supplement.
• He works part-time to supplement his income.
• The textbook comes with an online supplement.
• Vitamin D supplements are recommended in winter.
• The magazine’s travel supplement featured Italy.
• They supplement their diet with fresh vegetables.