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English definition of “demarcation”

demarcation

noun [C or U]     /ˌdiː.mɑːˈkeɪ.ʃən/ US  /-mɑːr-/ (US also demarkation)
a border or a rule that shows the limits of something or how things are divided : The river serves as the line of demarcation (= the line showing the separation ) between the two counties . In some schools there is little demarcation between subjects (= subjects are not taught separately ). On this map , demarcations between regions are shown with dotted lines .Isolating and separating
(Definition of demarcation noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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