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English definition of “proprietary”

proprietary

adjective [before noun]
 
 
/prəˈpraɪətəri/ US   /prəˈpraɪəteri/
MARKETING, COMMERCE used to describe a product that is made and sold by a particular company whose name, or a name that it owns, is on the product: The products were developed using two proprietary and patented technologies. The company focused too heavily proprietary products as the source of competitive advantage. a proprietary brand/name a proprietary drug/medicine proprietary software/systems
LAW relating to ideas or information that belong to one particular company and can only be used by them: proprietary content/data/information The equation used to produce the estimates is proprietary.
relating to an owner or to the fact of owning something: The employees have a proprietary interest in the company.
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(Definition of proprietary adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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