DEMARCATION
line, dividing line, demarcation, contrast
(noun) a conceptual separation or distinction; “there is a narrow line between sanity and insanity”
limit, demarcation, demarcation line
(noun) the boundary of a specific area
Source: WordNet® 3.1
Etymology
Noun
demarcation (countable and uncountable, plural demarcations)
The act of marking off a boundary or setting a limit, notably by belligerents signing a treaty or ceasefire.
A limit thus fixed, in full demarcation line.
Any strictly defined separation.
Anagrams
• Tremadocian
Source: Wiktionary
De`mar*ca"tion, n. Etym: [F. démarcation; pref. dé- (L. de) + marquer
to mark, of German origin. See Mark.]
Definition: The act of marking, or of ascertaining and setting a limit;
separation; distinction.
The speculative line of demarcation, where obedience ought to end and
resistance must begin, is faint, obscure, and not easily definable.
Burke.
Source: Webster’s Unabridged Dictionary 1913 Edition