"acuity" in the noun sense
1. acuity, visual acuity, sharp-sightedness
sharpness of vision the visual ability to resolve fine detail (usually measured by a Snellen chart)
2. acuteness, acuity, sharpness, keenness
a quick and penetrating intelligence
"he argued with great acuteness"
"I admired the keenness of his mind"
Source: WordNet® (An amazing lexical database of English)
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