The definition of acumen is the ability to quickly and accurately understand and deal with a situation or choice.
(noun)A person with common sense is an example of someone with acumen.
See acumen in Webster's New World College Dictionary
noun
Origin: L, a point, sting, mental acuteness < acuere, to sharpen < IE base *a-: see acid
See acumen in American Heritage Dictionary 4
noun
Origin:
Origin: Latin acūmen
Origin: , from acuere, to sharpen
Origin: , from acus, needle; see ak- in Indo-European roots
. Usage Note: The pronunciation (ə-kyo͞oˈmən), with stress on the second syllable, is an older, traditional pronunciation reflecting the word's Latin origin. In recent years it has been supplanted as the most common pronunciation of the word by an Anglicized variant with stress on the first syllable, (ăkˈyə-mən). In a recent survey, 68 percent of the Usage Panel chose this as their pronunciation, while 29 percent preferred the pronunciation with stress on the second syllable. The remaining 3 percent of the Panelists said they use both pronunciations.Learn more about acumen