demarkation

Noun

demarcation (countable and uncountable, plural demarcations)

1. The act of marking off a boundary or setting a limit, notably by belligerents signing a treaty or ceasefire.
2. A limit thus fixed, in full demarcation line.
   • About sunset, he was leaning on the remains of an old wall, which had once probably surrounded a Roman encampment, and now served as a line of demarcation between two villages, as jealous of each other's claims as near neighbours usually are.1831, L[etitia] E[lizabeth] L[andon], Romance and Reality. […], volume III, London: Henry Colburn and Richard Bentley, […], →OCLC, pages 48–49
3. Any strictly defined separation.
   • There is an alleged, in fact somewhat artificial demarcation in the type of work done by members of different trade unions.