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English definition of “demarcation”

demarcation

noun [C or U] uk   /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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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