The Collaborative International Dictionary of English v.0.48:
Demarcate \De*mar"cate\, v. t. [See Demarcation.] To mark by bounds; to set the limits of; to separate; to discriminate. --Wilkinson. [1913 Webster]WordNet (r) 3.0 (2006):
demarcate v 1: separate clearly, as if by boundaries 2: set, mark, or draw the boundaries of something [syn: demarcate, delimit, delimitate]