copartner

[ koh-pahrt-ner, koh-pahrt- ]

/ koʊˈpɑrt nər, ˈkoʊˌpɑrt- /

a partner or associate, as in a business.

Origin of copartner

First recorded in 1495–1505; co- + partner

co·part·ner·ship, noun

In the other I was a co-partner, and only received, on a division, the equal portion allotted me.

The Domestic Life of Thomas Jefferson Compiled From Family Letters and Reminiscences |Sarah N. Randolph
The latter found the National Founders' Association as their antagonist or potential "co-partner" in the industry.

A History of Trade Unionism in the United States |Selig Perlman
And just to this extent he had become a co-partner in their crime.

The Pit Prop Syndicate |Freeman Wills Crofts
At this juncture of affairs Almagro, a co-partner in the Peruvian expedition, arrived on the scene with a strong reinforcement.

Wealth of the World's Waste Places and Oceania |Jewett Castello Gilson

He was driven over to the jail, and his co-partner in crime, Joseph Seminole, brought into his presence.

Hands Up; or Thirty-Five Years of Detective Life in the Mountains and on the Plains |D. J. Cook

copartner

/ (kəʊˈpɑːtnə) /

a partner or associate, esp an equal partner in business