ACUITY
acuteness, acuity, sharpness, keenness
(noun) a quick and penetrating intelligence; “he argued with great acuteness”; “I admired the keenness of his mind”
acuity, visual acuity, sharp-sightedness
(noun) sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)
Source: WordNet® 3.1
Etymology
Noun
acuity (plural acuities)
Sharpness or acuteness, as of a needle, wit, etc.
Source: Wiktionary
A*cu"i*ty, n. Etym: [LL. acuitas: cf. F. acuité.]
Definition: Sharpness or acuteness, as of a needle, wit, etc.
Source: Webster’s Unabridged Dictionary 1913 Edition