De`mar*ca"tion (?), n. [F.
démarcation; pref. dé- (L. de) +
marquer to mark, of German origin. See Mark.] The
act of marking, or of ascertaining and setting a limit; separation;
The speculative line of demarcation, where
obedience ought to end and resistance must begin, is faint, obscure,
and not easily definable. Burke.