Толковый словарь английского языка Oxford English Reference - demarcation

n. 1 the act of marking a boundary or limits. 2 the trade-union practice of strictly assigning specific jobs to different unions. Phrases and idioms demarcation dispute an inter-union dispute about who does a particular job. Derivatives demarcate v.tr. demarcator n. Etymology: Sp. demarcaci{oacute}n f. demarcar mark the bounds of (as DE-, MARK(1))