supplement

Meanings

Noun

• textual matter that is added onto a publication; usually at the end
• a quantity added (e.g. to make up for a deficiency)
• a supplementary component that improves capability

Verb

• add as a supplement to what seems insufficient
  • "supplement your diet"
• serve as a supplement to
  • "Vitamins supplemented his meager diet"
• add to the very end

Synonyms

accessory, add on, add-on, addendum, affix, append, appurtenance, postscript, supplementation