Definitions for "coauthor"
A legislator authorized by the primary author to join in the authorship of a bill or resolution. A coauthor must be a member of the chamber in which the bill was filed.
A member of either house whose name is added to a bill as a coauthor by amending the bill, usually indicating support for the proposal.
One who shares authorship of a work. Coauthors all have bylines. Coauthors share royalties based on their contribution to the book.
a writer who collaborates with others in writing something.