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acuity

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

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
Related formshy·per·a·cu·i·ty, nounnon·a·cu·i·ty, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for acuities

acuity

noun
  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
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Word Origin

C15: from Old French, from Latin acūtus acute
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for acuities

acuity

n.

early 15c., from Middle French acuité (16c.) or directly from Medieval Latin acuitatem (nominative acuitas) "sharpness," from Latin acuere "to sharpen," related to acus "needle," acuere "to sharpen," from PIE root *ak- "rise to a point, be sharp" (see acrid).

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Online Etymology Dictionary, © 2010 Douglas Harper

acuities in Medicine

acuity

(ə-kyōōĭ-tē)
n.
  1. Sharpness, clearness, and distinctness of perception or vision.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.