verb (used with object), de·mar·cat·ed, de·mar·cat·ing.
to determine or mark off the boundaries or limits of: to demarcate a piece of property.
to separate distinctly: to demarcate the lots with fences.
Origin of demarcate
First recorded in 1810–20; back formation from demarcation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
to mark, fix, or draw the boundaries, limits, etc, of
to separate or distinguish between (areas with unclear boundaries)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
1816, back-formation from demarcation. Related: Demarcated; demarcating.
Online Etymology Dictionary, © 2010 Douglas Harper