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cofounder

American  
[koh-foun-der] / koʊˈfaʊn dər /
Or co-founder

noun

  1. a person who founds or establishes something with another.


Etymology

Origin of cofounder

First recorded in 1595–1605; co- + founder 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

OpenAI, CEO Sam Altman and Microsoft are listed as defendants in former OpenAI cofounder Elon Musk’s lawsuit over OpenAI’s creation of a “capped profit” subsidiary in 2019.

From MarketWatch • Apr. 27, 2026

Karl Diesseroth is a cofounder and a scientific advisory board member of Stellaromics and Maplight Therapeutics, and advises RedTree and Modulight.bio.

From Science Daily • Mar. 26, 2026

Why Palantir cofounder and CEO Alex Karp views working with Western militaries not just as a business opportunity, but as a higher calling.

From Slate • Mar. 22, 2026

The technology can reduce costs for utilities that typically rely on workers to inspect vast numbers of assets, while also improving safety, said Jack Curtis, a cofounder and the company’s chief commercial officer.

From The Wall Street Journal • Feb. 9, 2026

Steve Ballmer: March 24, 1956 Let’s not forget a man every bit as famous as Gates: Steve Jobs, the cofounder of Apple Computer.

From "Outliers" by Malcolm Gladwell

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