The state of being associated
A marriage is a partnership, not a dictatorship.
He entered into partnership with the Copelands, who continued his business.
Pitt had some time before (1785) offered a commercial partnership, which had been rejected on the ground that it involved the ultimate right of England to tax Ireland.
Articles written in common soon led to a complete literary partnership, and 1831 there appeared in the Revue de Paris a joint novel entitled Prima Donna and signed Jules Sand.