cofounder

or co-found·er

[koh-foun-der]
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noun

a person who founds or establishes something with another.

Origin of cofounder

First recorded in 1595–1605; co- + founder1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for cofounder

Contemporary Examples of cofounder