Plural of acuity; multiple instances of sharpness, keenness, or sensitivity of perception.
From Latin 'acuitas' (sharpness), derived from 'acus' (needle, sharp point). English added the plural '-ies' ending.
'Acuity' is famously used for vision ('visual acuity') and hearing ('auditory acuity'), but it can describe any sense or quality being sharp—your business acuity means your sharp business judgment, showing how the word evolved from physical sharpness to mental keenness.
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