A demarcation is a line, boundary, or other conceptual separation between things. Geographically, a demarcation might be the border that separates two countries or the river that divides two regions.

Demarcation comes from the German word for mark. Although it's often used as a term regarding geographical borders and boundaries, it can also be used to describe lines between categories or groups. For example, a definite demarcation exists between people who love the Boston Red Sox and those who love the New York Yankees.

Definitions of demarcation

n the boundary of a specific area

demarcation line, limit
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the outside limit of an object or area or surface; a place farthest away from the center of something
city limit, city limits
the limits of the area occupied by a city or town
upper limit
the limit on the upper (or northernmost) side of something
lower limit
the limit on the lower (or southernmost) side of something
three-mile limit
the limit of a nation's territorial waters
a strip forming the outer edge of something
the edge of a piece of cloth; especially the finished edge that has been doubled under and stitched down
(nautical) the forward edge of a fore-and-aft sail that is next to the mast
border, molding, moulding
a decorative recessed or relieved surface on an edge
selvage, selvedge
the edge of a fabric that is woven so that it will not ravel or fray
berm, shoulder
a narrow edge of land (usually unpaved) along the side of a road
roadside, wayside
edge of a way or road or path
Type of:
bound, boundary, bounds
the line or plane indicating the limit or extent of something

n a conceptual separation or distinction

contrast, dividing line, line
Rubicon, point of no return
a line that when crossed permits of no return and typically results in irrevocable commitment
Type of:
differentiation, distinction
a discrimination between things as different and distinct

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