An example of a demarcation is a city limit sign.
An example of a demarcation is drawing an out of bounds line for a baseball field.
A line of demarcation between two rock strata.
There is an alleged, in fact somewhat artificial demarcation in the type of work done by members of different trade unions.
Origin of demarcation
From American Heritage Dictionary of the English Language, 5th Edition
- First recorded c.1752, from Spanish linea de demarcacion and/or Portuguese linha de demarcação, the demarcation line laid down by the Pope on May 4, 1493, dividing the New World between Spain and Portugal on a line 100 leagues west of the Cape Verde Islands. Both derive from demarcar, from de- + marcar (“to mark”), from Italian marcare, from the Germanic root of march.