demarcation

1. The act of marking off a boundary or setting a limit, notably by belligerents signing a treaty or ceasefire. (countable, uncountable)
2. A limit thus fixed, in full demarcation line. (countable, uncountable)
3. Any strictly defined separation. (countable, uncountable) · There is an alleged, in fact somewhat artificial demarcation in the type of work done by members of different trade unions.

Plural demarcations