plural proprietorships
Definition of proprietorship
1
: the state or fact of being a proprietor : ownership
proprietorship of a medical product proprietorship of a copyright English proprietorship of Dunkirk was brief, because four years later King Charles II sold the port to France for ready cash—five million livres.— Niger Calder
2
: something (such land or a business) owned by a proprietor
Each business organization is structured in one of three ways: (1) as a sole proprietorship, (2) as a partnership, or (3) as a corporation. A sole proprietorship is owned and operated by one individual. The owner reaps all profits and is responsible for all the debts of the business.— Harriet E. Jones, et al. Six of the colonies that eventually would form the nation were either founded or came under English rule during that period: New York, New Jersey, Pennsylvania (including Delaware), and North and South Carolina. All were proprietorships: that is, like Maryland they were granted in their entirety to one man or a group of men, who both held title to the soil and controlled the government. Charles II gave these vast American holdings as rewards to the men who had supported him during his years of exile.— Mary Beth Norton et al.
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Merriam-Webster unabridged
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Time Traveler for proprietorship
The first known use of proprietorship was in 1669
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