Apedia

Acuity From  Latin  Noun French   Middle  From Acuere

Title acuity
Text
Merriam-Webster's Collegiate Dictionary
acu·ity

 \\ə-ˈkyü-ə-tē, a-\\ noun 
(plural -ities)
 ETYMOLOGY  Middle English acuite acridity, from Middle French acuité, from Medieval Latin acuitat-, acuitas, from Latin acuere
 DATE  1543
: keenness of perception : 
sharpness
English Etymology
acuity
  1540s, from 
M.Fr
http://M.Fr
. acuité, from M.L. acuitatem (nom. acuitas) "sharpness," from L. acus "needle," acuere "to sharpen," from PIEbase *ak- "rise to a point, be sharp" (see acrid).
Oxford Advanced Learner's Dictionary-牛津双解-OALD7
acuity
acu·ity E5kju:Eti / noun[U]
   (formal) the ability to think, see or hear clearly
   (思维、视力、听力的)敏度,敏锐
Webster's Third New International Dictionary, Unabridged
acu·i·ty
\əˈkyüəd.ē, aˈ-, -ətē, -i\ noun
(-es)
Etymology: Middle French acuité, alteration (influenced by Latin acutus sharp, pointed) of Old French agüeté, from agu sharp (from Latin acutus) + -eté -ity — more at 
acute
: 
sharpness
acuteness
 : keenness of sense perception
 acuity of hearing >
or acuteness or perceptiveness of mind
 < Wordsworth's acuity is exercised on common objects — Herbert Read >
— see visual acuity

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