[uh-kyoo-muhn, ak-yuh-]
keen insight; shrewdness: remarkable acumen in business matters.

1525–35; < Latin acūmen sharpness, equivalent to acū- (stem of acuere to sharpen; see acute) + -men noun suffix

acuminous [uh-kyoo-muh-nuhs] , adjective
unacuminous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acumen (ˈækjʊˌmɛn, əˈkjuːmən)
the ability to judge well; keen discernment; insight
[C16: from Latin: sharpness, from acuere to sharpen, from acus needle]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1530s, from L. acumen "a point, sting," hence "sharpness, shrewdness," from acuere "to sharpen" (see acuity).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Turning a life into a livelihood requires more than talent and business acumen.
You aren't getting anywhere near that degree without some statistics acumen.
Certainly he had a rare combination of charm, intelligence and political acumen.
But even though he has the training of a lawyer and the acumen of an
  accountant, he never forgets that he is playing a game.
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