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English definition of “co-author”

co-author

noun [C] uk (US coauthor)   /kəʊˈɔː.θər/ us    /koʊˈɑː.θɚ/
one of two or more people who write a book, article, report, etc. together

co-author

verb [T] uk (US coauthor)   /kəʊˈɔː.θər/ us    /koʊˈɑː.θɚ/
to write a book, article, report, etc. together with another person or other people: Robert and his daughter have co-authored a diet book specifically written for young women.
(Definition of co-author from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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