copartner

noun

co·​part·​ner ˌkō-ˈpärt-nər 

variants or co-partner

plural copartners or co-partners

: a fellow partner

his copartner in the business

Whether you're communicating with a co-partner, client … or industry influencer, the language that you use has the power to make or break those relationships.

—Serenity Gibbons

Word History

First Known Use

circa 1504, in the meaning defined above