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supplement

noun
  1. a supplementary component that improves capability
    accessory
  2. a quantity added (e.g. to make up for a deficiency)
    supplementation
  3. textual matter that is added onto a publication
    addendumpostscript
verb
  1. add to the very end
    affixadd onappend
  2. add as a supplement to what seems insufficient
    “supplement your diet”
  3. to serve as a supplement to
    “Vitamins supplemented their meager diet.”