perspicacity

[pur-spi-kas-i-tee]
noun
1.
keenness of mental perception and understanding; discernment; penetration.
2.
Archaic. keen vision.

Origin:
1540–50; earlier perspicacite < Late Latin perspicācitās sharpness of sight, equivalent to perspicāci- (stem of perspicāx sharp-sighted; see perspicuous) + -tās -ty2


1. shrewdness, acuity, astuteness, insight, acumen. See perspicuity.


1. obtuseness.
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World English Dictionary
perspicacious (ˌpɜːspɪˈkeɪʃəs)
 
adj
1.  acutely perceptive or discerning
2.  archaic having keen eyesight
 
[C17: from Latin perspicax, from perspicere to look at closely; see perspective]
 
perspi'caciously
 
adv
 
perspicacity
 
n
 
perspi'caciousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

perspicacity
1540s, from M.Fr. perspicacité (15c.), from L.L. perspicacitas "sharp-sightedness, discernment," from L. perspicax "sharp-sighted," from perspicere "look through" (see perspective).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
His theme is the purposeless drifting of people now in their 20s and he
  presents it with remarkable restraint and perspicacity.
Sadly, perhaps the rush to print overcomes accuracy and perspicacity.
The brevity has an elegant perspicacity.
She always congratulates them on their perspicacity.
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