/ ˌdiːmɑːˈkeɪʃn; NAmE -mɑːrˈk-/ noun
[ U , C ] a border or line that separates two things, such as types of work, groups of people or areas of land :
It was hard to draw clear lines of demarcation between work and leisure.
social demarcations
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WORD ORIGIN
early 18th cent.: from Spanish demarcación , from demarcar mark the bounds of, ultimately of Germanic origin and related to mark . Originally used in the phrase line of demarcation ( Spanish línea de demarcación , Portuguese linha de demarcação ), the word denoted a line dividing the New World between the Spanish and Portuguese, laid down by the Pope in 1493.