de·mar·cate

[dih-mahr-keyt, dee-mahr-keyt]
verb (used with object), de·mar·cat·ed, de·mar·cat·ing.
1.
to determine or mark off the boundaries or limits of: to demarcate a piece of property.
2.
to separate distinctly: to demarcate the lots with fences.

Origin:
1810–20; back formation from demarcation

de·mar·ca·tor, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
demarcate (ˈdiːmɑːˌkeɪt) [Click for IPA pronunciation guide]
 
vb
1.  to mark, fix, or draw the boundaries, limits, etc, of
2.  to separate or distinguish between (areas with unclear boundaries)
 
'demarcator
 
n

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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00:10
Demarcate is always a great word to know.
So is gobo. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

demarcate
1816, back-formation from demarcation. Related: Demarcated (1882); demarcating (1840).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We should avoid contact by all means, protect their environment, demarcate
  their lands and let them live their traditional lives.
Few people yet want to demarcate where it will stop.
The urine scent marks would be used in the same way the dogs use urine to
  demarcate their territory.
Males emit a loud call to demarcate their territory and warn rivals away.
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