/ Dictionary / Index A acuity: Meaning and Definition of Find definitions for: a•cu•i•ty Pronunciation: (u-ky'i-tē), [key] — n. sharpness; acuteness; keenness: acuity of vision; acuity of mind. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: acuity (Thesaurus) Acuff aculeate Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language