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 Whitmer’s name was floated as a possible 2024 presidential candidate amid voters' concern over Biden’s age and mental acuity. Laura Gersony, The Arizona Republic, 4 Apr. 2024 Questions around age and acuity have surrounded the 2024 race with the presumptive general election matchup between Donald Trump, 77, and Joe Biden, 81, who would each hold the distinction of being the oldest person to take the oath of office if sworn in next January. Sudiksha Kochi, USA TODAY, 17 Mar. 2024 By Molly Cook Escobar Mr. Biden and his allies have rejected anxieties about his age and mental acuity as unfair and inaccurate. Ruth Igielnik, New York Times, 3 Mar. 2024 Now with the general election informally underway at a time when the age and acuity of both presumptive presidential nominees is being driven to the forefront, experts say questions about Harris − and eventually Trump's running mate − will only get louder. Joey Garrison, USA TODAY, 14 Mar. 2024 The focus on Biden's memory Hur's report also featured a number of observations about Mr. Biden's memory that dominated headlines and became fodder for GOP opposition in the weeks that followed, as concern about the president's mental acuity and age surfaced during his reelection campaign. Kaia Hubbard, CBS News, 12 Mar. 2024 The already intense scrutiny of Biden’s age was magnified when special counsel Robert Hur raised questions about the president’s mental acuity in his report last month on Biden’s handling of classified information. Zeke Miller, Fortune, 8 Mar. 2024 The negative impact on children, their growth, and mental acuity is even more astounding. Eleanor Dearman, Fort Worth Star-Telegram, 15 Feb. 2024 And fair or not, fewer than half of voters express similar doubts about Donald J. Trump’s age or mental acuity. Nate Cohn, New York Times, 9 Feb. 2024

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'acuity.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

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

Dictionary Entries Near acuity

Cite this Entry

“Acuity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/acuity. Accessed 18 Apr. 2024.

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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