PROPRIETARY Meaning of PROPRIETARY in English proprietar|y BrE AmE prə ˈpra ɪ ‿ət‿ ə r |i AmE \ -ə ter |i▷ proprietar|ies iz▷ proprietar|ily ə l i -ɪ li Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012