co-founder in English dictionary co-founder Meanings and definitions 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 A person who is involved, along with one or more others, with helping in the creation of a business, organization, union, or entity. more Grammar and declension of co-founder co-founder ( plural co-founders) co-founder (plural co-founders) more Sample sentences with "co-founder" Declension Stem Try again Available translations Arabic Bangla Croatian Czech Danish Dutch Estonian Finnish French German Hungarian Indonesian Italian Japanese Polish Portuguese Quechua Romanian Russian Slovak Slovenian Spanish Swedish Turkish Authors