coauthor

American  

[koh-aw-ther, koh-aw-] / koʊˈɔ θər, ˈkoʊˌɔ- /

noun

1. one of two or more joint authors.

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verb (used with object)

1. to write in joint authorship.

coauthor British  

/ kəʊˈɔːθə /

noun

1. a person who shares the writing of a book, article, etc, with another

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verb

1. (tr) to be the joint author of (a book, article, etc)

Etymology

Origin of coauthor

First recorded in 1860–65; co- + author

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Explanation

A coauthor is someone who works with another person to write something. If three people take turns writing chapters of a novel, each of them can call herself a coauthor. 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. And if you collaborate with a friend on a hand-written magazine, you are one of its coauthors. The word comes from author, or writer, and the prefix co, which means "together" or "mutually."

Example Sentences

See Examples For:

coauthor

"This new dataset fixes coordinate errors in previous Earth rotation studies. Additionally, it improves the accuracy of dating and reconstructing historical astronomical events," said coauthor Mitsuru Sôma of the National Astronomical Observatory of Japan.

From Science Daily ● Oct. 26, 2026

Carly Phillips, a coauthor and senior scientist at the nonprofit Union of Concerned Scientists, said that’s why research focusing on the role these companies play in the climate crisis is important.

From Los Angeles Times ● Aug. 26, 2026

One galaxy stood out in particular, according to coauthor Martje Slob, a doctoral candidate at Leiden University.

From Science Daily ● Aug. 22, 2026

Núñez was coauthor of a study published in 2023 in the journal Buildings that examined a type of concrete building higher than 20 stories and built to minimum Venezuelan code requirements.

From Los Angeles Times ● Jun. 27, 2026

He was the coauthor of the then latest edition of the modern bible of chess, Modern Chess Openings, which contained thousands of variations, positions, analyses, and recommendations.

From "Endgame" by Frank Brady

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