cofound

verb

co·​found ˌkō-ˈfau̇nd 

variants or co-found

cofounded or co-founded; cofounding or co-founding

transitive verb

: to join one or more others in founding (something, such as an organization or institution) : to found (something) jointly

Renowned prankster and engineer Steve Wozniak has returned to the company he cofounded seven years ago.

—Paul Freiberger

… she went on to co-found the Agricultural Workers Association, which would eventually become the United Farm Workers.

—Ericka N. Goodman-Hughey

cofounder

ˌkō-ˈfau̇n-dər 

noun

or co-founder

plural cofounders or co-founders

… Beach Boys' legend and cofounder Brian Wilson performing the entire album "Pet Sounds" is enough to give any summer concertgoer a good vibration.

—Craig S. Semon

Word History

First Known Use

circa 1661, in the meaning defined above