a·cu·men

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

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

a·cu·mi·nous [uh-kyoo-muh-nuhs] , adjective
un·a·cu·mi·nous, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
acumen (ˈækjʊˌmɛn, əˈkjuːmən) [Click for IPA pronunciation guide]
 
n
the ability to judge well; keen discernment; insight
 
[C16: from Latin: sharpness, from acuere to sharpen, from acus needle]
 
a'cuminous
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Acumen is a GRE word you need to know.
So is abnegate. Does it mean:
To refuse or deny oneself some rights, conveniences, etc.; reject; renounce.
the art or practice of divination or a related omen, token, or indication
Etymonline
Word Origin & History

acumen
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
War has left many people with little education, let alone business 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.
Turning a life into a livelihood requires more than talent and business acumen.
Candace, known for her business acumen, has overcome a number of hurdles in her
  life.
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