demarcate UK /ˈdiːmɑːˌkeɪt/US /dɪˈmɑɹˌkeɪt/ verb2 •To mark the limits or boundaries of something; to delimit.But these words didn't follow the precepts of the metric system, the official standard for demarcating the universe into manageable, studyable chunks. — 2023 •To mark the difference between two causes of action; to distinguish. formsdemarcated · demarcating · demarcates