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.

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 sale, run by RR Auction, includes some of Apple’s early items and childhood belongings of Jobs, Apple’s cofounder and chief executive, who died in 2011 at 56, after battling pancreatic cancer.

From Los Angeles Times • Jan. 13, 2026

Anything around 415,000 vehicles should be good enough to keep the stock stable, said cofounder Gary Black.

From Barron's • Dec. 31, 2025

Dan didn’t recognize Steve Wozniak, the cofounder of Apple Computer.

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