also: ごうちょ
noun
joint authorship; co-authorship
Refers to the act or state of writing a work together with one or more other authors. Often used in academic or literary contexts.
この論文は三人の研究者の合著です。
This paper is a joint work by three researchers.
合著で本を出版する予定だ。
We plan to publish a book as co-authors.
共著 is the more common and modern term for joint authorship. 合著 is less frequent and may appear in older or formal contexts.
Compound of 合 (joint, together) and 著 (writing, authorship). The reading がっちょ is a standard on'yomi combination; ごうちょ is a less common variant.