/ prəˈpraɪətri; NAmE -teri/ adjective [ usually before noun ]
1.
( of goods ) made and sold by a particular company and protected by a registered trademark :
a proprietary medicine
proprietary brands
a proprietary name
2.
relating to an owner or to the fact of owning sth :
The company has a proprietary right to the property.
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WORD ORIGIN
late Middle English (as a noun denoting a member of a religious order who held property): from late Latin proprietarius proprietor, from proprietas , from proprius one's own, particular.