demarkation


de·mar·ca·tion

also de·mar·ka·tion D0119100 (dē′mär-kā′shən)n.1. The setting or marking of boundaries or limits.2. 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).]