n. One who is jointly concerned with one or more persons in business, etc.; a partner; an associate; a partaker; a sharer. [ 1913 Webster ]
the associates and copartners of our loss. Milton. [ 1913 Webster ]
n. 1. The state of being a copartner or of having a joint interest in any matter. [ 1913 Webster ]
2. A partnership or firm; as, A. and B. have this day formed a copartnership. [ 1913 Webster ]
n.; pl. Copartneries the state of being copartners in any undertaking. [ R. ] [ 1913 Webster ]