The state of being a copartner or of having a joint interest in any matter.(noun)
A partnership or firm.(noun)
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Use "copartnership" in a sentence
" It is proposd to have the Ballads set to Music, and I am going to lay seige to Mr Shield for his copartnership, and to print the Music with the Book."
"A plea for farming and farming corporations: Showing the profit of farming over trade, and the best place for carrying it on, for the attainment of a competence, ... or copartnership over single-handed farming by A."
"He exhibited his client as a simple-hearted, honest, well-meaning man, who, during a copartnership of twelve years, had gradually become impoverished, while his partner (his former clerk) having no funds but his share of the same business, into which he had been admitted without any advance of stock, had become gradually more and more wealthy."