pin-point

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.
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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
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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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