acu·ity /əˈkjuəti, æ-/
acu·ity /əˈkjuətɪ/ 名詞
A·cu·i·ty n. Sharpness or acuteness, as of a needle, wit, etc.
n 1: sharpness of vision; the visual ability to resolve fine
detail (usually measured by a Snellen chart) [syn: visual
2: a quick and penetrating intelligence; "he argued with great
acuteness"; "I admired the keenness of his mind" [syn: acuteness,