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English definition of “proprietary”

proprietary

adjective [before noun]     /prəˈpraɪə.tər.i/ US  /-ter.i/
relating to owning something, or relating to or like an owner: I just assumed he owned the place - he had a proprietary air about him.Having and owning - general words describes goods that are made and sent out by a particular company whose name is on the product: proprietary medicinesProducts and producersBuying and selling in general
(Definition of proprietary adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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