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Greyhawk Supplement 1975.jpg


Middle English, from Latin supplementum, from supplēre to fill up, complete


  • 1 a : something that completes or makes an addition The action of supplying what is wanting; the making good of a deficiency or shortcoming.
b : dietary supplement
  • 2 : a part added to or issued as a continuation of a book or periodical to correct errors or make additions
  • 3 : an angle or arc that when added to a given angle or arc equals 180°


A supplement is a publication that has a role secondary to that of another preceding or concurrent publication.

A follow-on publication complements its predecessor, either by bringing it up-to-date (e.g. the Index Catalogue), or by otherwise enhancing the predecessor's coverage of a particular topic or subject matter, as in the Tosefta. Supplements are particularly popular and useful in gaming hobbies.

A newspaper supplement, often a weekly section of its parent, usually has a tabloid or magazine format and covers wide-ranging and less time-critical subjects, as in The American Weekly, the 2004 version of Life, and Parade; newspaper supplements became common in France and Germany in the mid to late 19th century--they were called feuillton in French. In Chinese, they are called fukan.