Acuity (noun)

1. Sharpness or keenness of insight, judgment, or perception.
2. Sharpness or clarity of vision.
3. Keenness or sensitivity of a sense or faculty.

Origin:

Late 16th century: from latin acuitas, from acuere "sharpen".

Examples:

1. His acuity in solving problems was unmatched.
2. Her acuity in spotting small details was impressive.
3. The acuity of his sense of hearing was remarkable.
4. The acuity of his political judgment was a major asset.
5. Her acuity in negotiations was the key to her success.