acuity

noun

acu·​i·​ty ə-ˈkyü-ə-tē How to pronounce acuity (audio)
a-
plural acuities
Synonyms of acuitynext
: 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.
Colbert also pressed former White House press secretary Karine Jean-Pierre on Biden’s cognitive acuity, as Jean-Pierre was promoting her new book in October. Asher Notheis, The Washington Examiner, 25 Dec. 2025 The relationship between mother and daughter—depicted with layered acuity and fraught with shame, disgust, love, desire, betrayal, veneration, and rage—is the burning centre of the novel. Hazlitt, 23 Dec. 2025 Lee throws himself into all of it with a sad-sack slapstick energy that never undercuts—and, remarkably, even enhances—the psychological acuity of his acting. Justin Chang, New Yorker, 23 Dec. 2025 The incident reportedly left the 22-year-old — who Jeffrey claims has the mental acuity of an 11-year-old — with bruises on her wrist from zip ties used to restrain her. Sean Neumann, PEOPLE, 8 Dec. 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 28 Dec. 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

Last Updated: - Updated example sentences
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