supplement

Definitions of supplement in various dictionaries:

noun - textual matter that is added onto a publication

noun - a quantity added (e.g. to make up for a deficiency)

noun - a supplementary component that improves capability

verb - add as a supplement to what seems insufficient

verb - serve as a supplement to

verb - add to the very end

Something added to complete a thing, make up for a deficiency, or extend or strengthen the whole.

A section added to a book or document to give further information or to correct errors.

A separate section devoted to a special subject inserted into a periodical, such as a newspaper.

The angle or arc that when added to a given angle or arc makes 180 or a semicircle.