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Definitions of trade paperback:
noun: A softcover edition of a previously hardcover book, usually produced with the exact same text as the hardcover.
noun: A paperback book that is in one of the standard sizes for small paperbacks, generally for genre fiction.
noun: (comic books) A type of comic book whose content primarily consists of previously published material, usually originally in a periodical format, and bound together as one work, or part of a series itself.