1. Copartnership.

2. A joint partner or sharer.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• xopartner,
• vopartner,
• fopartner,
• dopartner,
• cipartner,
• ckpartner,
• clpartner,
• cppartner,
• c0partner,
• c9partner,
• cooartner,
• colartner,
• co-artner,
• co-partner,
• coparner,
• coparter,
• co parner,
• co parter,
• copartnor,
• co-partnor

• cooperative,
• cooperate,
• cooperation,
• covert,
• partner,
• cooperator.

The adjective form of the word "copartner" is "copartnership"

The plural of the "copartner" can be the "copartners".

The singular of the "copartner" can be the "copartner".