Co-author vs. Coauthor – Which is Correct?
Both “co-author” and “coauthor” are correct American English spellings for someone who writes a work with another person, or for the verb describing that collaboration. “Co-author” is often preferred for readability, while “coauthor” follows the closed-compound style. Choose one form and use it consistently in formal writing.
Co-author or Coauthor – Which is Correct?
Both co-author and coauthor are correct. They have the same meaning and can function as either a noun or a verb. A co-author or coauthor is a person who writes a book, article, report, study, or other work with one or more people. As a verb, the word means to write something collaboratively.
The hyphenated form, co-author, can make the word easier to read, especially when it appears before another noun or in formal prose. The closed form, coauthor, is also standard and is increasingly common in publishing, journalism, academic writing, and digital content. Style guides and publishers may prefer one form, so consistency is more important than choosing one universally “correct” spelling.
For broader workplace relationships, distinguish shared authorship from the roles described in Colleague vs. Co-Worker.
The Best Trick to Remember the Difference
Use the clarity test: if joining co and author looks crowded or difficult to read, use co-author. If the combined word looks natural in your publication’s style, use coauthor. You can also remember that the prefix co- means “together” or “jointly”; both spellings express the same idea of shared authorship.
| Word | Part of Speech | Meaning | Example |
|---|---|---|---|
| co-author | Noun or verb | A joint writer; to write jointly | She was the co-author of the report. |
| coauthor | Noun or verb | A joint writer; to write jointly | They coauthored a study on climate policy. |
How to Use Co-Author
Co-author is used as a noun for a person who shares responsibility for writing a work. It can also be used as a verb when describing the act of writing with another person. The hyphenated spelling is clear, familiar, and appropriate in casual, professional, academic, and formal contexts.
As a noun, it commonly follows possessive determiners or linking verbs: my co-author, her co-author, or the second co-author. As a verb, it usually takes an object, such as co-author a book or co-author an article.
Example 1: Dr. Patel was my co-author on the medical textbook.
Example 2: The two researchers will co-author an article for the journal.
Example 3: Her co-author handled the references and final editing.
What are the different forms of Co-Author?
As a noun, the plural form is co-authors: “The co-authors received an award.” As a verb, the base form is co-author, the third-person singular form is co-authors, the past tense and past participle are co-authored, and the present participle is co-authoring.
Etymology of the word Co-Author
Co-author combines the prefix co-, meaning “together,” “jointly,” or “with,” with author, which comes from the Latin auctor, meaning “originator,” “creator,” or “promoter.” The hyphen helps show that the two parts form a single concept involving shared authorship.
How to Use Coauthor
Coauthor has exactly the same meaning and grammatical uses as co-author. It can refer to a joint writer as a noun or describe collaborative writing as a verb. This closed spelling is especially common in American English publishing, online journalism, academic materials, and professional biographies.
The spelling coauthor may look more streamlined, but it should not be confused with a different word. Use it in phrases such as coauthor of the book, coauthor an article, and her longtime coauthor.
Example 1: He is a coauthor of the bestselling economics book.
Example 2: The professors coauthored a paper about language acquisition.
Example 3: Each coauthor approved the final version of the manuscript.
What are the different forms of Coauthor?
As a noun, the plural is coauthors: “The coauthors presented their findings.” As a verb, the third-person singular form is coauthors, the past tense and past participle are coauthored, and the present participle is coauthoring.
Etymology of the word Coauthor
Coauthor has the same origin as co-author. It combines co-, meaning “together” or “jointly,” with author. The closed spelling developed as compounds beginning with co- became more familiar and style conventions increasingly allowed them to appear as single words.
Related Concepts
Understanding compound words and collaborative authorship makes the difference between these two spellings easier to recognize.
- Compound words: A compound word combines two or more words or word elements to create a single meaning. Compounds may be written as open phrases, hyphenated words, or closed words, depending on usage and style.
- Prefixes: The prefix co- means “together,” “jointly,” or “with.” It appears in words such as co-worker, cooperate, and cofounder.
- Collaborative authorship: Collaborative authorship occurs when two or more people contribute substantially to a written work. Co-authors may share research, drafting, editing, or overall responsibility.
- Style guides: Dictionaries, publishers, journals, and organizations may choose different preferences for hyphenated and closed compounds. Following the relevant style guide helps maintain consistency.
Examples from Media and Literature
The word appears in many contexts involving books, research, journalism, and creative collaboration:
- Books: A publisher may describe two novelists as the co-authors of a historical fiction series.
- Academic journals: A research article may list several coauthors who contributed to the study’s design, analysis, and writing.
- News reports: A newspaper might identify a reporter as the co-author of an investigative series.
- Memoirs: A public figure may work with a professional writer as a co-author on a memoir.
- Screenwriting: Film coverage may identify two writers who coauthored the screenplay.
Practice Exercises
Choose the correct word to complete each sentence. In these exercises, either spelling may be grammatically correct; select the form that best matches the stated style preference.
- The two scientists decided to ________ a paper for the journal. (Use the hyphenated form.)
- Maria is the lead ________ of the guidebook. (Use the closed form.)
- The ________ reviewed every chapter before publication. (Use the hyphenated form.)
- Several researchers ________ the report. (Use the closed form.)
- The publisher listed both writers as ________. (Use the hyphenated form.)
Answer Key
- co-author
- coauthor
- co-author
- coauthored
- co-authors
Co-Author Synonyms
| Synonym | Definition |
|---|---|
| Collaborator | A person who works jointly with another person or group. |
| Joint author | A person who shares authorship of a written work. |
| Writing partner | A person who writes with another writer, usually in a creative or informal context. |
| Contributor | A person who supplies material, ideas, or work to a larger project. |
Coauthor Synonyms
| Synonym | Definition |
|---|---|
| Collaborator | Someone who creates or works on a project jointly with another person. |
| Joint writer | A writer who shares responsibility for producing a work. |
| Writing partner | A person who shares the writing process with another writer. |
| Contributor | Someone who provides content or ideas to a publication or project, although not necessarily full authorship. |
Frequently Asked Questions
Question 1: Is co-author or coauthor correct?
Both co-author and coauthor are correct spellings in American English. They have the same meaning and grammatical function.
Question 2: Which spelling is more common, co-author or coauthor?
Usage varies by publisher, dictionary, and style guide. The hyphenated form may be easier to read, while the closed form is common in modern academic, journalistic, and digital writing.
Question 3: Is co-author a noun or a verb?
It can be either. As a noun, it means a person who shares authorship. As a verb, it means to write something with another person.
Question 4: What is the plural of co-author?
The plural is co-authors. The plural of coauthor is coauthors.
Question 5: Should I use the hyphenated or closed spelling?
Choose the form preferred by your publisher, employer, school, or style guide. If no specific preference exists, either spelling is acceptable; use it consistently throughout the document.
Conclusion
Co-author and coauthor are both correct American English forms meaning a joint writer or to write jointly. The hyphenated version can improve readability, while the closed version follows a streamlined compound-word style. Pro tip: In professional writing, consistency and adherence to your organization’s style guide protect your credibility more than choosing one form over the other.
