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cofounder

or co-found·er

[koh-foun-der]
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noun
  1. a person who founds or establishes something with another.
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Origin of cofounder

First recorded in 1595–1605; co- + founder1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for co-founder

Contemporary Examples

Historical Examples

  • Sevier had survived his old friend, co-founder with him of Watauga, by one year.

    Pioneers of the Old Southwest

    Constance Lindsay Skinner

  • He was Master of the college of which he was co-founder, but regularly spent the emoluments on fresh buildings at Caius.

    Cambridge

    Mildred Anna Rosalie Tuker

  • Dr. Schoenhofer is co-founder of the nursing aesthetics publication, Nightingale Songs.