a·cu·i·ty

[uh-kyoo-i-tee]
noun
sharpness; acuteness; keenness: acuity of vision; acuity of mind.

Origin:
1375–1425; late Middle English acuite < Old French < Medieval Latin, Late Latin acuitās, equivalent to Latin acu(ere) to sharpen or acū(tus) sharpened (see acute) + -itās -ity

hy·per·a·cu·i·ty, noun
non·a·cu·i·ty, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
acuity (əˈkjuːɪtɪ) [Click for IPA pronunciation guide]
 
n
1.  keenness or acuteness, esp in vision or thought
2.  the capacity of the eye to see fine detail, measured by determining the finest detail that can just be detected
 
[C15: from Old French, from Latin acūtusacute]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Acuity is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

acuity
1540s, from M.Fr. acuité, from M.L. acuitatem (nom. acuitas) "sharpness," from L. acus "needle," acuere "to sharpen," from PIE base *ak- "rise to a point, be sharp" (see acrid).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

acuity a·cu·i·ty (ə-ky&oomacr;'ĭ-tē)
n.
Sharpness, clearness, and distinctness of perception or vision.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Carey stirs his bowl of allusive soup with a new spoon of social acuity.
Trump's political acuity lies in his ability to take these grievances and turn
  them into politics.
In addition to their excellent visual acuity, turkeys also have awesome
  peripheral vision.
It nods in the direction of various books and films about prison life, often
  with considerable acuity.
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