Definition of "co-founder" []

• A person who is involved with helping in the creation of a business, organization, union, or entity, but is not the original founding person. (noun)

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• "He is identified as co-founder and general counsel for EDI, not as an SEC employee."
• "NEW ROLE: With a title of co-founder, Brin will work on strategic projects, with an emphasis on new products."
• "Gary Vaynerchuk, best known as co-founder of Vaynermedia and author of "Crush It" and "The Thank-You Economy", has joined HubSpot's advisory board."