DEMARCATOR Meaning of DEMARCATOR in English demarcator BrE AmE ˈdiː mɑːk eɪt ə AmE \ di ˈmɑːrk eɪt̬ ə r ˈdiː mɑːrk eɪt̬ ə r ▷ demarcator|s z Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012