Omnibus edition

An omnibus edition or omnibus is a book containing multiple creative works by the same or, more rarely, different authors. Commonly two or more of the works have been previously published as books, but a collection of shorter works, or shorter works collected with one previous book, may also be known as an omnibus.

Omnibus editions help consolidate longer series into fewer books. The prices are usually equal to or less than the price of buying each individual edition separately.