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