demarcation-n; 2 Senses

Sense Number 1: a dividing region between areas

Commentary: DEMARCATION[+location][+region][+dividing]
NOTE: refers to a structure, not a process (see Sense 2)

Engineers described a horizontal band that produced a distinct demarcation two inches from the top.
This old wall is the demarcation of the original Roman settlement from later periods of construction.
The hardened lave formed a demarcation between two layers of sedimentary rock.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: the act of differentiating or distinguishing things

Commentary: DEMARCATION[+activity][+process][+differentiating]
NOTE: refers to a process

There was a demarcation of Berlin into four sectors after World War II.
These policies are emphasizing a demarcation between the haves and have-nots.
It's an interesting book on the demarcation between metaphysics and science.

WordNet 3.0 Sense Numbers: 2