perspicacity
American Heritage Dictionary:
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per·spi·cac·i·ty
(pûr'spĭ-kăs'ĭ-tē) 
n.
Acuteness of perception, discernment, or understanding.
n.
Acuteness of perception, discernment, or understanding.
Roget's Thesaurus:
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perspicacity
noun
- Skill in perceiving, discriminating, or judging: acumen, astuteness, clear-sightedness, discernment, discrimination, eye, keenness, nose, penetration, perceptiveness, percipience, percipiency, sagacity, sageness, shrewdness, wit. See ability/inability, careful/careless.
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Copyrights:
American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Roget's Thesaurus
Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary Copyright © 1995 byHoughton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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