Dē'mar-kā'tion, n.
n. [Fr. démarcation, Sp. demarcacion, from Fr. démarquer, to take a mark off from, Pr. demarcher, to mark off by bounds, Sp. & Pg. demarcar, from de and marquer, marcar, to mark. See MARK and MARCHES.]
Sense 1. The act of marking, or of ascertaining and setting a limit; division; separation.
Sense 2. A limit or bound ascertained and fixed; quality of serving as a dividing limit.
The speculative line of demarkation, where obedience ought to end and resistance begin, is faint, obscure, and not easily definable. Locke.