[de.mar.cate] vt -cat.ed ; -cat.ing [back-formation fr. demarcation, fr. Sp demarcacion, fr. demarcar to delimit, fr. de- + marcar to mark, prob. fr. It marcare, of Gmc origin; akin to OHG marha boundary--more at mark] (1816) 1: delimit
2: to set apart: separate -- de.mar.ca.tion n