noun Something added; especially, such an addition added to make up for a deficiency.
noun An extension to a document or publication that adds information, corrects errors, or brings up to date.
noun An additional section of a newspaper devoted to a specific subject; an additional section of a journal issue, or an additional issue, for a similar purpose.
the literary supplement
noun An angle that, when added to a given angle, makes 180°; a supplementary angle.
noun A vitamin, herbal extract, or chemical compound ingested to meet dietary deficiencies or enhance muscular development; the dosage form that conveys or embodies it (e.g., tablet, capsule, pill, powder, beverage).
Vitamins, minerals, and essential fatty acids must come from either the diet or supplements.
noun A surcharge, additional cost, especially for food in a restaurant.
There is a £2 supplement if you choose the steak.
noun An adjunct that is nonessential, especially a supplementary relative clause.
verb To provide or make a supplement to something.