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cofounder

American

[koh-foun-der] / koʊˈfaʊn dər /

Or co-founder

noun

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

President Donald Trump, a fierce opponent of AI regulation, counts OpenAI's cofounder Sam Altman and its president Greg Brockman among his biggest donors.

From Barron's • Apr. 25, 2026

For one, even extremely capable, long-running agents can’t be held liable for their actions, said Box cofounder and CEO Aaron Levie, also speaking at the Summit.

From The Wall Street Journal • Mar. 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

He thanked Steve Jobs, or, at least, quoted the Apple cofounder: In the first sixteen to eighteen years of our lives, we have lived between 140,160 hours to 157,680 hours.

From "A Deadly Wandering: A Mystery, a Landmark Investigation, and the Astonishing Science of Attention in the Digital Age" by Matt Richtel

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023