A picture, diagram, map, design, or other graphic device which appears within the text of a printed work whose purpose is to elucidate or embellish the text. In a book, illustrations are often listed at the beginning in the front matter. Photographs may be grouped together in one or several sections within a book. Maps and genealogies may appear on the endpapers. Magazines and children's books are often profusely illustrated. Abbreviated ill. or illus.