supplement

Etymology

From Latin supplementum (“that which is added to supply a shortage”), from supplere (“to provide something”).

noun

1. Something added, especially to make up for a deficiency.
   Athletes' use of herbal supplements has skyrocketed in the past two decades. At the top of the list of popular herbs are echinacea and ginseng, whereas garlic, St. John's wort, soybean, ephedra and others are also surging in popularity or have been historically prevalent. 2013-03, David S. Senchina, “Athletics and Herbal Supplements”, in American Scientist, volume 101, number 2, archived from the original on 2013-05-16, page 134
2. An extension to a document or publication that adds information, corrects errors or brings up to date.
3. (journalism) An additional section of a newspaper devoted to a specific subject.
   the literary supplement
4. (geometry) An angle that, when added to a given angle, makes 180°; a supplementary angle.
5. (nutrition, bodybuilding) A vitamin, herbal extract or chemical compound ingested to meet dietary deficiencies or enhance muscular development.
6. A surcharge, additional cost, especially for food in a restaurant.
   There is a £2 supplement if you choose the steak.

verb

1. To provide or make a supplement to something.
   I supplement my income by working as a model.