What is the meaning of co authored?

: one who collaborates with another person in authoring a literary or dramatic work, a document, a legislative bill, etc. coauthors of many books and plays the coauthors of new legislation.

Is it co authored or co authored?

You can spell the noun coauthor with or without a hyphen — co-author is also correct. Whenever it takes more than one person to write a book, the book can be said to have coauthors. ... The word comes from author, or writer, and the prefix co, which means "together" or "mutually."