Noun
The act of marking, or of ascertaining and setting a limit; separation; distinction.
Source: Webster's dictionaryMy most important problem was destroying the lines of demarcation that separate what seems real from what seems fantastic. Gabriel García Márquez
A fairly clear line separated advertisement from art. ... The first effect of the triumph of the capitalist (if we allow him to triumph) will be that that line of demarcation will entirely disappear. There will be no art that might not just as well be advertisement. G. K. Chesterton
If a demarcation criterion exists (we must not, I think, seek a sharp or decisive one), it may lie just in that part of science which Sir Karl ignores. Thomas Samuel Kuhn
Above all, maintain the line of demarcation between parties; for it is only by maintaining the independence of party that you can maintain the integrity of public men, and the power and influence of Parliament itself. Benjamin Disraeli
The first who endeavored to draw a clear line of demarcation between these distinct departments, was Hutton, who declared that geology was in no ways concerned with 'questions as to the origin of things. Charles Lyell
Although our powers are great, they are not unlimited-they are bounded by some lines of demarcation. Charles Abbott, 1st Baron Tenterden