acuity

noun

acu·​i·​ty ə-ˈkyü-ə-tē How to pronounce acuity (audio)
a-
plural acuities
: keenness of perception
hearing acuity
mental acuity

Did you know?

Do you have acuity or sensitivity?

Acuity is nearly synonymous with at least one sense of sensitivity, yet, as is so often the case with closely related words, there are subtle differences worth observing before you substitute one of these words for the other. Acuity does refer to a form of sensitivity, but it is most often applied to the perceptual senses (as in “visual acuity” or “auditory acuity”). It is also frequently used in reference to the intellect (as in “mental acuity”). Sensitivity has a broader range of meanings than acuity does, including “the capacity of being easily hurt.” It may be used of inanimate objects such as radios (“the sensitivity of the instruments was carefully calibrated”), a context in which acuity is unusual.

Examples of acuity in a Sentence

a worrisome deterioration in the acuity of his hearing over the years
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Biden’s return to the national stage comes ahead of the release of multiple books looking at how his aides grappled with questions about his mental acuity during his time in office. Brian Bennett, Time, 6 May 2025 Biden released detailed summaries of his physical exams while in office, but several books published in recent months have raised questions about his mental acuity in his final months in the White House. Swapna Venugopal Ramaswamy, USA Today, 12 Apr. 2025 Implicit bias, a lack of cultural acuity and acumen among medical staff, and the history of America’s medical field have all played a part in this reality. Lynnette Nicholas, Essence, 11 Apr. 2025 Biden left office in November with approval ratings underwater, and some Democrats continue to blame him for Trump’s victory after his age and mental acuity became the dominant narrative around his reelection bid. Amie Parnes, The Hill, 12 Feb. 2025 See All Example Sentences for acuity

Word History

Etymology

Middle English acuite "sharpness, acridity," borrowed from Middle French acuité, borrowed from Medieval Latin acuitāt-, acuitās, from Latin acu-, stem of acuere "to sharpen" + -itāt-, -itās -ity — more at acute

First Known Use

circa 1549, in the meaning defined above

Time Traveler
The first known use of acuity was circa 1549

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Cite this Entry

“Acuity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/acuity. Accessed 21 May. 2025.

Kids Definition

acuity

noun
acu·​ity ə-ˈkyü-ət-ē How to pronounce acuity (audio)
: sharpness of perception

Medical Definition

acuity

noun
acu·​ity ə-ˈkyü-ət-ē How to pronounce acuity (audio)
plural acuities
: keenness of sense perception
acuity of hearing
see visual acuity

More from Merriam-Webster on acuity

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