[dih-mahr-keyt, dee-mahr-keyt]
verb (used with object), demarcated, demarcating.
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.

1810–20; back formation from demarcation

demarcator, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
demarcate (ˈdiːmɑːˌkeɪt)
1.  to mark, fix, or draw the boundaries, limits, etc, of
2.  to separate or distinguish between (areas with unclear boundaries)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1816, back-formation from demarcation. Related: Demarcated (1882); demarcating (1840).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The result should be a stack with all five maps in alignment and all five
  regions demarcated by the students visible at once.
Hiking off the demarcated trails should be avoided, as you should stick to the
  hiking plan you've established before your trip.
The pretense of neatly demarcated progress points up its absence.
These moisture and temperature zones were demarcated on the topographic maps.
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