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acuity (n.)

"sharpness, acuteness," early 15c., from Old French acuite (14c.) or directly from Medieval Latin acuitatem (nominative acuitas) "sharpness," noun of state from Latin acuere "to sharpen," literal and figurative (of intellect, emotion, etc.), related to acus "a needle" (from PIE root *ak- "be sharp, rise (out) to a point, pierce").

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Definitions of acuity from WordNet

acuity (n.)
sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart);
Synonyms: visual acuity / sharp-sightedness
acuity (n.)
a quick and penetrating intelligence;
Synonyms: acuteness / sharpness / keenness
From wordnet.princeton.edu