A clear line or boundary that marks the limit or division between two areas, groups, or concepts.
From French démarcation, from Spanish demarcar (de- + marca, mark). It entered English in the 1600s to describe boundary disputes between colonial territories.
The 38th parallel was the demarcation between North and South Korea—one invisible line that divided families, languages, and political futures, showing how a theoretical boundary becomes heartbreakingly real.
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