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 acuity acuity /əˈkjuːɪti/

noun

  1. A quick and penetrating intelligence  ( acuity , acuteness , keenness , sharpness )
    a quick and penetrating intelligence
     He argued with great acuteness
    he argued with great acuteness
     I admired the keenness of his mind
    I admired the keenness of his mind
  2. Sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)  ( acuity , sharp-sightedness , visual acuity )
    sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)