adjective. Of or relating to a proprietor or to ownership.

adjective. Privately owned, as a business.

adjective. Owned by a private individual or corporation under a trademark or patent.

noun. A proprietor or group of proprietors.

noun. Ownership; proprietorship.

noun. A proprietary medicine.

noun. One granted ownership of a proprietary colony.

Belonging to a proprietor or owner; of or pertaining to property or ownership: as, proprietary rights.

noun. One who has exclusive title; one who possesses or holds the title to a thing in his own right; an owner; a proprietor; specifically, in American colonial history, the grantee or owner, or one of the owners, of one of those colonies called proprietary colonies (in distinction from charter colonies and royal colonies or provinces). See colony, 1.

noun. A body of proprietors collectively: as, the proprietary of a county.

noun. The right of proprietor; ownership.

noun. In monasteries, a monk who had reserved goods and effects to himself, not withstanding his renunciation of all at the time of his profession.

noun. A proprietor or owner; one who has exclusive title to a thing; one who possesses, or holds the title to, a thing in his own right.

noun. A body proprietors, taken collectively.

noun. A monk who had reserved goods and effects to himself, notwithstanding his renunciation of all at the time of profession.

adjective. Belonging, or pertaining, to a proprietor; considered as property; owned.

adjective. manufactured articles which some person or persons have exclusive right to make and sell.

adjective. Of or relating to property or ownership, as proprietary rights.

adjective. Of or relating to the quality of being an owner, as the proprietary class.

adjective. Manufactured exclusively by the owner of intellectual property rights (IPR), as with a patent or trade secret.

adjective. Privately owned, as a proprietary lake.

adjective. Possessive, jealous, or territorial.

adjective. protected by trademark or patent or copyright; made or produced or distributed by one having exclusive rights

noun. an unincorporated business owned by a single person who is responsible for its liabilities and entitled to its profits

"But after Lehman went bankrupt, former Federal Reserve Chairman Paul Volcker often talked about proprietary trading at banks, and the term "proprietary" became confusing (to say nothing of, dare we say, sullied.) "They wanted to distinguish what they do from other firms that use the term proprietary trading," explains Overdahl."