The term "definitive edition" refers to a version or release of something that is considered to be complete, final and authoritative. It usually implies that this particular edition contains all the necessary information, features or content that were intended by the creator, and no further updates or changes are planned for it. In other words, it's the ultimate and definitive version of whatever it may be - a book, game, album, movie, etc. It is often used to distinguish this edition from previous ones which might have been incomplete or lacking certain elements, or to indicate that this release contains everything that was intended by the creator, making it the best and most complete version available.