WordWeb Online

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

Derived forms: acuities

Type of: intelligence, sight, vision, visual modality, visual sense

Encyclopedia: Acuity