Definition & Meaning of "omnibus edition"

What is an "omnibus edition"?

An omnibus edition is a single volume that combines several related works, such as books, stories, or series, into one large book. This edition brings together multiple titles, often by the same author or within the same series, allowing readers to access a collection of works in a convenient format. Omnibus editions are useful for readers who want to experience a complete series or collection without purchasing each volume separately, and they often feature additional content like introductions, illustrations, or annotations.