1. a person or organization that publishes a book, journal, or other work jointly with one or more other publishers
Usage: commonly used in academic and trade publishing

Examples

• The university and the independent press served as copublishers of the research anthology.
• Two major publishing houses became copublishers of the bestselling novel to expand its distribution.
• The copublisher shared both the production costs and the profits from the textbook.
• Working as a copublisher allowed the smaller firm to access a wider audience.
• The agreement between the copublishers outlined their respective responsibilities for marketing and sales.