: 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
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
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