the determining and marking off of the boundaries of something.
2.
separation by distinct boundaries: line of demarcation.
Also, de⋅mar⋅ka⋅tion.
Origin: 1720–30; Latinization of Sp demarcación (in linea de demarcación line of demarcation, dividing the world between Spain and Portugal) deriv. of demarcar to mark out the bounds of, equiv. to de-de-+ marcar < It marcare < Gmc; see mark1, -ation
de·mar·ca·tion also de·mar·ka·tion (dē'mär-kā'shən) n.
The setting or marking of boundaries or limits.
A separation; a distinction: a line of demarcation between two rock strata.
[Spanish demarcación, from demarcar, to mark boundaries : de-, off (from Latin dē-; see de-) + marcar, to mark (from Italian marcare, from Old Italian, of Germanic origin; see merg- in Indo-European roots).]
de·mar·ka·tion (dē'mär-kā'shən) n. Variant of demarcation.