acuity
sharpness of perception or sense
Root
- acer / acu / acr: sharp, pointed, keen, or bitter
Other words with the acer / acu / acr root
Acuity is sharpness turned into perception: the eye, ear, or mind catches fine detail.
The tutor had enough acuity to see exactly where the student was guessing.
Acute gives the sharp point. Acuity turns that sharpness into ability. Visual acuity sees clearly; mental acuity notices what others miss.