Two or more people who jointly write or create a book, article, research paper, or other written work together as equal contributors.
From 'co-' (together) + 'authors' (from Latin 'auctor' meaning originator or creator). This term became especially common in academic and scientific publishing where multiple researchers contribute to the same work.
Science papers now often have dozens of coauthors from different countries working on the same research, which is why the order of author names can become a contentious negotiation—it matters for credit and careers!
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