pinpoint

[pin-point]
noun
1.
the point of a pin.
2.
a trifle; pinhead.
3.
a tiny spot or sharp point.
verb (used with object)
4.
to locate or describe exactly or precisely: to pinpoint the problem.
adjective
5.
exact; precise: pinpoint accuracy.

Origin:
1840–50; pin + point


3. spot, localize, identify, define.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pinpoint (ˈpɪnˌpɔɪnt)
 
vb
1.  to locate or identify exactly: to pinpoint a problem; to pinpoint a place on a map
 
n
2.  an insignificant or trifling thing
3.  the point of a pin
4.  (modifier) exact: a pinpoint aim

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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Etymonline
Word Origin & History

pinpoint
"locate precisely," 1917, from pin + point; originally aviators' slang.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There are so many, it's difficult to pinpoint it down to one.
Researchers can then work backward to pinpoint the time and place of the
  lightning.
The first thing you should do is pinpoint the exact location of the campus,
  especially if you're driving.
But he hadn't been able to pinpoint their source-until now.
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