per·spi·cac·i·ty

[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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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Perspicacity is a GRE word you need to know.
So is permeate. Does it mean:
To commit: 3. v.t., To present, execute, or do in a poor or tasteless manner:
To pervade.
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World English Dictionary
perspicacious (ˌpɜːspɪˈkeɪʃəs) [Click for IPA pronunciation guide]
 
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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
They seem to be devoid of perspicacity-an unthinking lot of puppets merely carrying out the instructions of the director.
She always congratulates them on their perspicacity.
His theme is the purposeless drifting of people now in their 20s and he
  presents it with remarkable restraint and perspicacity.
She wishes the presenters would just write significant words on the board and
  talk about them with wit and perspicacity.
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