acuity

From Middle English acuite, acuyte, from Middle French acuité, from Medieval Latin acuitas, irreg., from Latin acuō (“sharpen”).

• IPA^(key): /əˈkjuːɪti/

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acuity (plural acuities)

1. Sharpness or acuteness, as of a needle, wit, etc.
2. The ability to think, see, or hear clearly.

   The old woman with dementia lost her mental acuity.

• visual acuity

• acute
• acutance
• acuteness
• acuition

• acuity in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
• “acuity”, in The Century Dictionary […], New York, N.Y.: The Century Co., 1911, →OCLC.
• acuity at OneLook Dictionary Search