proprietorPronunciation: /prəˈprʌɪətə/Translate proprietor | into French | into German | into Italian | into Spanish Definition of proprietor noun the owner of a business, or a holder of property: Chinese restaurant proprietors by 1640 he was himself the proprietor of a three-hundred-acre tractDerivatives proprietorship noun Spelling helpRemember that proprietor ends with -or.proprietor in other Oxford dictionaries Definition of proprietor in the US English dictionary