noun
coauthor; joint author; collaborator
Refers to a person who jointly creates a written work, such as a book, article, or report.
この本は三人の共作者によって書かれた。
This book was written by three coauthors.
彼は論文の共作者として名を連ねている。
He is listed as a coauthor of the paper.
Very similar in meaning, but 共著者 is more common in bibliographic contexts.
Compound of 共 (きょう, 'together') + 作者 (さくしゃ, 'author').