supplement

Noun
  1. Textual matter that is added onto a publication;
    Usually at the end (synset 106411274)
  2. A quantity added (e.g. to make up for a deficiency) (synset 105118072)
  3. A supplementary component that improves capability (synset 102674051)
Verb
  1. Add as a supplement to what seems insufficient (synset 202347128)
    "supplement your diet"
  2. Serve as a supplement to (synset 202758806)
    "Vitamins supplemented his meager diet"
  3. Add to the very end (synset 201331387)
    "He appended a glossary to his novel where he used an invented language"

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