From Longman Dictionary of Contemporary Englishadvance copyadvance copya copy of a book, record etc that has not yet been made available to the public → advance
Examples from the Corpus
advance copy• By the time he did, her new book was out and her publishers had sent him an advance copy.• One day Harry comes into the office silently holding up an advance copy of one of the professional journals.• The Advocate wound up releasing advance copies of the interview to the media over Thanksgivinga week before our board meeting.From Longman Business Dictionaryadvance copyadˌvance ˈcopy [countable] a book, magazine, report etc that is sent to someone to look at, before supplies become generally available to the publicThe newspaper managed to get hold of an advance copy of the report. → copy 